path: root/DialogOnSoftwareProjectManagement.rst

==============================================
Dialog On Software Project Management
==============================================

:Authors: Hui Lan (lanhui at zjnu.edu.cn)

:Version: 0.0.9 of 2020-03-24


.. contents:: Table of content


Preface
=========

This book contains a series of special lecture notes in a dialog form on software project management during the Great Lockdown period due to the outbreak of 2019 novel coronavirus.


Monday, 24 February 2020
========================


Morning section
-----------------

*Discussing communications method - Reuse old project -  Atomic commit - Old plan getting outdated very soon - People factor - Feature creep - Bloatware - Proprietary software - Positive reinforcement - Seemingly free but not actually free - No free lunch theorem - Netscape versus Microsoft on the web browser market share - Bundle sale of software products*

1525200991(1525200991)10:21:32
@蓝老师 Good morning. Some students can't access the QQ group and they wish if you could use DingTalk instead, it's more accessible for them

(2459455104)10:28:52  good morning laoshi i have an error on the site

Samantha 201632120140(2459455104)10:29:06  yes ding talk works for me too

蓝老师(1348141770)10:29:43  Sorry I don't have DingTalk.

蓝老师(1348141770)10:30:15  Don't enter Password at kiwiirc.com

ibrahim(1525200991)10:30:41  and we can't find the channel on freenode network

ibrahim(1525200991)10:31:36  it's available in Nettalk(which is empty)

蓝老师(1348141770)10:32:42  In the bottom panel of the Nettalk software.  Enter the following three commands in sequence.

蓝老师(1348141770)10:33:19  /server irc.freenode.org

蓝老师(1348141770)10:33:29  /nick MY_REAL_NAME

蓝老师(1348141770)10:33:37  /join #spm

蓝老师(1348141770)10:34:55  If you use the online client https://kiwiirc.com/nextclient/

nainezz(2407048879)10:35:33
Are we using qq or nettalk

蓝老师(1348141770)10:36:25  We will primarily use QQ.

ibrahim(1525200991)10:37:18

ibrahim(1525200991)10:37:25
@蓝老师

软英171郑洪宇(1633787262)10:38:18
@蓝老师 连不上诶

蓝老师(1348141770)10:38:41  You can.  I believe that.

陈真赐(1312502742)10:39:20
haha

蓝老师(1348141770)10:39:34  Hi guys.  Let's wait for five minutes for more people to come.

软英171郑洪宇(1633787262)10:40:44
一直ing

Npl.(593635848)10:41:03
大家好，我是邵天扬

系统消息(10000)10:41:03
Npl.加入本群。

张滨(2350711965)10:41:04
大家好，我是张滨。

系统消息(10000)10:41:04
去年今日加入本群。

软英171高增(1520653544)10:41:07

软英171高增(1520653544)10:41:19
I can

蓝老师(1348141770)10:41:44  Anyway, we are going to use QQ Group primarily.

蓝老师(1348141770)10:41:57  IRC channel is for people who could not connect to QQ Group.

软英171周仙龙(1748153603)10:42:09
Connecting...

蓝老师(1348141770)10:43:40  I am not very familiar with QQ Group.  You should pardon me if I appear to be slow in response.

软英171高增(1520653544)10:44:09
so，if we can use QQ,we needn't use IRC?

Saeed : 201732120146(446571011)10:44:10
freenode :what is that for ?

Samantha 201632120140(2459455104)10:45:15
keeps on saying connecting then still gives error  so will fix it later since we will do class here

蓝老师(1348141770)10:45:15  A freenode IRC channel is like a chatting room.  But since we have QQ group, we will use QQ group.

Samantha 201632120140(2459455104)10:45:25

蓝老师(1348141770)10:46:01  OK.  Guys.  If you have QQ access, you are fine.  If you (or your friends) do not have QQ access, you are fine too.

蓝老师(1348141770)10:46:23  I will post our talking scripts after class.

Saeed : 201732120146(446571011)10:46:37
ok

蓝老师(1348141770)10:46:44

蓝老师(1348141770)10:47:01  I guess everyone knows our course home page.  The third bullet.

ALBOROM WARD-201732120143家长(3279308836)10:47:20
yes

蓝老师(1348141770)10:47:24  The home page is the main place where I post quizzes, assignments, etc.

ibrahim(1525200991)10:47:29
yes

Saeed : 201732120146(446571011)10:47:42
yes

蓝老师(1348141770)10:47:50

蓝老师(1348141770)10:48:29  Here is the textbook.  I think it is great.  It has a French translation -- good news for a number of students who speak French).

ibrahim(1525200991)10:48:30
sure

蓝老师(1348141770)10:48:54  It also has a Chinese translation.  Unfortunately, I don't know how to make a PDF file from the XML files.

Saeed : 201732120146(446571011)10:49:29
Arabica

蓝老师(1348141770)10:49:34  I plan to use this textbook, plus some essays on software project management.

Saeed : 201732120146(446571011)10:49:51

蓝老师(1348141770)10:50:05  Remind me to create quiz 2 submission portal on LRR.

蓝老师(1348141770)10:50:49  So I put more weight on Final Examination than before, 10% more.

蓝老师(1348141770)10:51:07  The reason is that I want you to do more independent reading.

软英171高增(1520653544)10:51:30
teacher，I think you can use QQ phone

蓝老师(1348141770)10:51:42  Quizzes are easy.  Most people can get full marks I think, as long as your answers make sense (and are Short).

ibrahim(1525200991)10:52:38
yes

201632120150-Ashly(1661411131)10:52:40
Yes

Saeed : 201732120146(446571011)10:52:41
Yes

201732120135 玛莎(3534763826)10:52:44
yea

蓝老师(1348141770)10:52:45  Not good at sound, video stuff.

ALBOROM WARD-201732120143家长(3279308836)10:52:46
Yes

201732120168_Golden(2984538488)10:52:52
Yes

软英171 郑可富(1924773187)10:52:52
Yes

nainezz(2407048879)10:52:55
@蓝老师 Yh   201732120147

Anderson (3034352269)10:53:01
Laoshi so what do we do since we can’t connect to the free node?

Samantha 201632120140(2459455104)10:53:03
yes

201732120134_Michelle(3304952232)10:53:05
yes

蓝老师(1348141770)10:53:19  My sound is badly distorted.

蓝老师(1348141770)10:53:28  Don't you think so?

Saeed : 201732120146(446571011)10:54:22
It’s good
  
蓝老师(1348141770)10:54:32

张滨(2350711965)10:54:35
Yeap

ALBOROM WARD-201732120143家长(3279308836)10:55:00
Yeah

蓝老师(1348141770)10:55:27  We are going to have 7-10 quizzes.

蓝老师(1348141770)10:55:47  We already have 2 now.

蓝老师(1348141770)10:56:06  You guys submit to LRR before the deadline.

蓝老师(1348141770)10:56:19  Course code: CSC322.

蓝老师(1348141770)10:56:34

蓝老师(1348141770)10:56:39  Course project.

蓝老师(1348141770)10:56:58  You can re-do stuff you did in my OOAD class.  Just make sure it is better.

蓝老师(1348141770)10:57:28  Most people did poorly in our OOAD project, particularly the part about commit messages.

蓝老师(1348141770)10:58:14  I hope you can understand the importance of atomic commits and use that concept in practice.

蓝老师(1348141770)10:58:21  ATOMIC COMMIT

ALBOROM WARD-201732120143家长(3279308836)10:58:40
Is it so important Laoshi?

蓝老师(1348141770)10:58:48  I am quite flexible on group size.  1,2,3,4, all acceptable.

蓝老师(1348141770)10:59:12  Quite important, for future maintainers.

蓝老师(1348141770)10:59:35  I am a bit worried about how you are going to collaborate remotely.

蓝老师(1348141770)10:59:57  But coronavirus is giving us a great chance to test that out.

蓝老师(1348141770)11:00:16  China's remote learning might become world-class after this epidemic.

201732120147 Anderson (3034352269)11:00:51
DingTalk

201732120147 Anderson (3034352269)11:01:06
Is good laoshi

蓝老师(1348141770)11:01:07  No country in the last century has suffered such a shutdown - everyone is forced to stay at home.

蓝老师(1348141770)11:01:34  Thank you, DingTalk guy.  Not going to use that now.

系统消息(10000)11:01:46
马龙加入本群。

FADHEL ABDULLAH(3071163205)11:01:46
大家好，我是FADHEL ABDULLAH 。

Saeed : 201732120146(446571011)11:01:58
@FADHEL ABDULLAH

蓝老师(1348141770)11:02:07  Welcome FADHEL ABDULLAH

蓝老师(1348141770)11:02:31  So you have a great advantage since you have taken my OOAD course.

蓝老师(1348141770)11:02:48  You could continue to work on the OAPS project.

蓝老师(1348141770)11:03:30  Make sure you make it better, e.g., better commit messages, better comments.

Samantha 201632120140(2459455104)11:04:08
okay

蓝老师(1348141770)11:04:42  This is something we need to worry later.  Hopefully we can have an on-site exam.

201632120150-Ashly(1661411131)11:05:36
For maintaining the LRR, are the files uploaded the most recent updates?

蓝老师(1348141770)11:05:37: Probably not.  I will upload the most updated LRR source code shortly.  Remind me if I forget.

蓝老师(1348141770)11:05:37  If not, I plan to do takehome exam.  That is, I give you a really long exam booklet, and you finish it in one day.

201732120147 Anderson (3034352269)11:05:58

蓝老师(1348141770)11:05:58  You finish it in one day, without consulting to external resources.

Saeed : 201732120146(446571011)11:06:04
Good

蓝老师(1348141770)11:06:16  You may need to sign something, e.g., Code of Conduct.

蓝老师(1348141770)11:06:21  Hope that won't happen.

Saeed : 201732120146(446571011)11:06:26
Not good

蓝老师(1348141770)11:06:30  Let's take a five-minute break.

201732120134_Michelle(3304952232)11:06:46
OK laoshi

蓝老师(1348141770)11:06:52  Will be back at 11:11am.

ALBOROM WARD-201732120143家长(3279308836)11:06:59
Ok

AHAMED SABUJ妈妈(2686217157)11:08:12

大家好，我是AHAMED SABUJ的妈妈。

系统消息(10000)11:08:12

201732120141-AHAMED SABUJ加入本群。

Samantha 201632120140(2459455104)11:09:33
好的

yahya22(1714796258)11:09:44
when are we supposed to submit quiz 2?

Saeed : 201732120146(446571011)11:10:11
Will create Quiz 2 late today.@蓝老师

ALBOROM WARD-201732120143家长(3279308836)11:10:11
Check lanlab.org website

201732120147 Anderson (3034352269)11:10:34
There is no link in LRR

Samantha 201632120140(2459455104)11:11:05
quiz 2 is not showing on LRR for me

Saeed : 201732120146(446571011)11:11:27

Saeed : 201732120146(446571011)11:11:32

ALBOROM WARD-201732120143家长(3279308836)11:11:38
He didn’t create link yet

ALBOROM WARD-201732120143家长(3279308836)11:11:40

@Samantha 201632120140

Samantha 201632120140(2459455104)11:11:46
oh okay thank you

系统消息(10000)11:11:53

201732120141--AHAMED SABUJ妈妈邀请201732120157 hossain arif加入了本群。

蓝老师(1348141770)11:12:39  Guys.  Let's move on.  I may take attendance at 11:55 by taking a screenshot.

ALBOROM WARD-201732120143家长(3279308836)11:12:59
Okay

nainezz(2407048879)11:13:45
Alright

ibrahim(1525200991)11:13:52
you just said there is no attendance ??

蓝老师(1348141770)11:13:55  As long as I am concerned, people factor is the most important.

蓝老师(1348141770)11:14:20  Developers are really valuable.

蓝老师(1348141770)11:14:48  One primary job of management is to create an environment in which developers can produce.

蓝老师(1348141770)11:15:20  Manager's job: "Create a Development Abstraction Layer" - Joel Spolsky.

Abadura Yahya 201732120136(1714796258)11:15:55
how do I join this thing?

蓝老师(1348141770)11:16:17  ???

Abadura Yahya 201732120136(1714796258)11:16:42
are you teaching live?

Saeed : 201732120146(446571011)11:16:48
@蓝老师  : How we can take the course online or just typing

蓝老师(1348141770)11:17:05  Just typing.  No video, no sound.

Abadura Yahya 201732120136(1714796258)11:17:13
oh okay

Saeed : 201732120146(446571011)11:17:21
How about attendance

Saeed : 201732120146(446571011)11:17:30
How it can be

蓝老师(1348141770)11:18:15  https://www.joelonsoftware.com/2006/04/11/the-development-abstraction-layer-2/

蓝老师(1348141770)11:18:38  This above link has an essay talking about development abstraction layer.  Maybe it will be your next reading.

蓝老师(1348141770)11:19:22  The other difficulty in management is that Old Plan becomes Old very soon.

蓝老师(1348141770)11:19:51  Things change really rapidly, before and after your customers see your product.

蓝老师(1348141770)11:20:31  Feature creep could drive you like crazy.

蓝老师(1348141770)11:20:42  Netscape team suffered this.

蓝老师(1348141770)11:21:36  They were working like crazy to compete with Microsoft, wanting to add more features to their browser,  Netscape Navigator.

Abadura Yahya 201732120136(1714796258)11:22:52
what happens to people who does not have QQ?

蓝老师(1348141770)11:22:55  Feature creep, if not well controlled, could mess up your codebase.

蓝老师(1348141770)11:23:22  Could also delay a planned release.

蓝老师(1348141770)11:24:14  If people do not have QQ, they should sign up for one.  If they could not sign up (I don't see the reason why they cannot), I will send them the lecture script.

蓝老师(1348141770)11:24:53  Netscape tried to make a bloatware.

蓝老师(1348141770)11:25:19  A bloatware that includes Netscape Navigator, Netscape Address Book, Netscape Mail, Newsgroups, and Netscape Composer.

Abadura Yahya 201732120136(1714796258)11:25:44
they couldn't.....what about attendance?

蓝老师(1348141770)11:26:01  The more you try to do, the more likely you make errors.

蓝老师(1348141770)11:26:18  Could they do IRC?

201732120151 Barkay sanoussi(3178573723)11:26:18
@Abadura Yahya 201732120136 read above messages

蓝老师(1348141770)11:26:33  Appearing on IRC is acceptable too.

蓝老师(1348141770)11:27:02  AVOID FEATURE CREEP.

蓝老师(1348141770)11:27:46  Admit that.

蓝老师(1348141770)11:27:58  You cannot do a lot of things in a limited period of time.

蓝老师(1348141770)11:28:06  Not to mention Great things.

Abadura Yahya 201732120136(1714796258)11:28:10
they can't it's not working for them

蓝老师(1348141770)11:28:10  Great things need time.

ibrahim(1525200991)11:28:19

Question

蓝老师(1348141770)11:28:28  Yes?

ibrahim(1525200991)11:28:54
what about if the stakeholders are asking to add more features?

ibrahim(1525200991)11:29:06
that may harm the base

Samantha 201632120140(2459455104)11:29:16
he addressed the issues before  @Abadura Yahya 201732120136  so you can ask him after the class so let him procees with the class and ask questions later please

蓝老师(1348141770)11:29:21  Tell them the impact of adding more features on the schedule.

ABDALMUHAYMEN M.A.KHALIL 201730210234(1071107298)11:29:24
Yes I was about to ask thie same question

ibrahim(1525200991)11:29:25
the same thing happend to Netscape

Samantha 201632120140(2459455104)11:29:35
proceed*

蓝老师(1348141770)11:29:53  So the Netscape team was like crazy in catching up.

蓝老师(1348141770)11:30:26  As a result, they delivered buggy products.

蓝老师(1348141770)11:30:39  Version 5.0 was delayed.

蓝老师(1348141770)11:30:55  Because they were unable to deliver a stable product.

蓝老师(1348141770)11:31:06  In fact, version 5.0 was never delivered.

蓝老师(1348141770)11:32:35  There is a documentary called Code Rush (55 minutes long).

蓝老师(1348141770)11:32:43  https://www.bilibili.com/video/av15989846?from=search&seid=9345778025746004042

蓝老师(1348141770)11:32:58  You could watch it when you have time.

蓝老师(1348141770)11:33:05  Let's take a five-minute break.

nainezz(2407048879)11:33:23
Ok

ABDALMUHAYMEN M.A.KHALIL 201730210234(1071107298)11:33:25

201632120150-Ashly(1661411131)11:33:25

201732120134_Michelle(3304952232)11:33:30
interesting!

201732120134_Michelle(3304952232)11:33:42
ok laoshi!

201632120150-Ashly(1661411131)11:33:47
The address is invalid

201632120150-Ashly(1661411131)11:34:11
For the documentary

ABDALMUHAYMEN M.A.KHALIL 201730210234(1071107298)11:34:21

蓝老师(1348141770)11:34:38  We will be back at 11:40.

Samantha 201632120140(2459455104)11:35:35
okay

蓝老师(1348141770)11:41:17  Let's move on.

蓝老师(1348141770)11:41:29  You watch the video when you have time.

蓝老师(1348141770)11:41:38  I won't use the lecture time for watching videos.

蓝老师(1348141770)11:42:58  The other thing that is Really important is that you need to make sure: am I developing/using Proprietary Software?

蓝老师(1348141770)11:43:30  If you use part of Proprietary Software (code) in your product, you are in danger of future trouble.

蓝老师(1348141770)11:43:37  Netscape team had that trouble.

蓝老师(1348141770)11:44:31  A few days before their major release,  they noticed that their code depended on Apple's code!

蓝老师(1348141770)11:44:49  Bang! They had to beg Apple for permission to use that code.

蓝老师(1348141770)11:44:52  Not allowed.

蓝老师(1348141770)11:45:03  They had to re-write that part overnight.

蓝老师(1348141770)11:45:33  It is generally OK if you don't sell your product which contains code of not your own.

蓝老师(1348141770)11:46:26  However, if you want to sell millions of copies of your product to make profit and include something from elsewhere (Proprietary, i.e., Owned by Others), then you are going to have headaches.

蓝老师(1348141770)11:48:05  As a serious software manager, you do need to know the Difference between Proprietary and Open source.

蓝老师(1348141770)11:48:24  People are looking at your money.

蓝老师(1348141770)11:49:08  In the US, people take copyright really seriously.

蓝老师(1348141770)11:49:18  That is good for a society.

蓝老师(1348141770)11:49:41  If people do not buy other people's efforts, no further efforts will be made.

蓝老师(1348141770)11:50:12  Positive reinforcement is needed in a healthy society.  The US government knows that.

蓝老师(1348141770)11:50:45  Some people may wonder:  I am using QQ for Free.

蓝老师(1348141770)11:50:58  The question is: is it Really free of charge?

蓝老师(1348141770)11:51:12  According to the No Free Lunch theorem, the answer is No.

蓝老师(1348141770)11:51:27  Tencent treats you (the customer) as a product!

蓝老师(1348141770)11:52:02  The company could make profit elsewhere, e.g., advertisements, social influence, government funds, etc.

ALBOROM WARD-201732120143家长(3279308836)11:52:02
It’s totally not free

ALBOROM WARD-201732120143家长(3279308836)11:52:10
Part of it free

蓝老师(1348141770)11:52:34  Microsoft did something similar.  IE is free.

蓝老师(1348141770)11:53:11  Miscrosoft spent lots of money (billions) on developing IE.

蓝老师(1348141770)11:53:24  How could it give it away for free?

蓝老师(1348141770)11:53:34  There is a purpose behind that: market share.

201732120141--AHAMED SABUJ妈妈(2686217157)11:54:10
that's how netscape loose thear market

蓝老师(1348141770)11:54:28  Same thing on online education, Tencent Meeting, Zoom Conferencing, etc.   They are free during the epidemic.

蓝老师(1348141770)11:55:01  Netscape tried to be free too, for personal use.

蓝老师(1348141770)11:55:17  But the bad thing is that Microsoft bundled their IE with the Windows operating system.

蓝老师(1348141770)11:55:40  90% of personal desktop computers were pre-installed with Windows.

蓝老师(1348141770)11:55:52  That is definitely an upper hand for Microsoft.

201732120141--AHAMED SABUJ妈妈(2686217157)11:56:00
yes here is the answer of quiz 2 haha

蓝老师(1348141770)11:56:27  Average people usually do not switch default browser if it is that bad.

蓝老师(1348141770)11:56:44  I mean average people, 70% of the people.

201732120141--AHAMED SABUJ妈妈(2686217157)11:57:06
teacher it's time to take attendance

蓝老师(1348141770)11:57:15  http://www-inst.eecs.berkeley.edu/~eecsba1/sp98/reports/eecsba1c/pj1/freq.gif

Saeed : 201732120146(446571011)11:57:47
@201732120141--AHAMED SABUJ妈妈 yeah

蓝老师(1348141770)11:57: === TAKE ATTENDANCE, PLEASE REPLY YOUR STUDENT NUMBER ===

ALBOROM WARD-201732120143家长(3279308836)11:58:06
201732120143

201732120141--AHAMED SABUJ妈妈(2686217157)11:58:09
201732120141

ABDALMUHAYMEN 201730210234(1071107298)11:58:11
201730210234

ibrahim(1525200991)11:58:12
201732120159

Abadura Yahya 201732120136(1714796258)11:58:12
201732120136 

陈真赐(1312502742)11:58:13  201732120114 

软英171 陆博业(2794513466)11:58:13  201732120119 

郑晓钰(280768265)11:58:14  201732120110 

nainezz(2407048879)11:58:15  201732120173 

Saeed : 201732120146(446571011)11:58:16  201732120146 

FADHEL ABDULLAH(3071163205)11:58:17  201532120139 

201732120134_Michelle(3304952232)11:58:17  201732120134 

叶涵涛(2289316051)11:58:17  201732120125 

李佳兴(421281726)11:58:21  201732120118 

张滨(2350711965)11:58:21  201732120127 

201732120157 hossain arif<charif19282@qq.com&get;11:58:23  201732120157 

201732120151 Barkay sanoussi(3178573723)11:58:24  201732120151 

谢佳聪(1249923715)11:58:28  201732120123 

软英171 吕伊豪(745291576)11:58:28  201732120120 

201732120147 Anderson (3034352269)11:58:30  201732120147 

201632120150-Ashly(1661411131)11:58:43  201632120150 

Samantha 201632120140(2459455104)11:58:50  201632120140 

软英171 郑可富(1924773187)11:58:53  201732120129 

软英171高增(1520653544)11:58:54  201732120117 

软英171陈金龙(864945570)11:58:57  201732120112 

应宇腾(1356633192)11:58:57  201732120126 

软英171戴泽荣(975336710)11:59:07  201732120115 

杰西卡(2422938906)11:59:11  201732120133 

201732120135 玛莎(3534763826)11:59:32  201732120135 

蓝老师(1348141770)11:59:33  Thanks guys. Bye. 

蓝老师(1348141770)11:59:52  Please do not ask questions here outside lecture time.  Use email. 

nainezz(2407048879)11:59:54
So the class is over  

ibrahim(1525200991)11:59:58
@蓝老师 check the people in iec

软英171陈伟超(937202326)12:00:00
201732120113 

Saeed : 201732120146(446571011)12:00:02
Class is over ?  

杰西卡(2422938906)12:00:05
oh is class  over?  

201732120141--AHAMED SABUJ妈妈(2686217157)12:00:09
appreciated  

ibrahim(1525200991)12:00:14
irc** 

ALBOROM WARD-201732120143家长(3279308836)12:00:20
Yeah over 

杰西卡(2422938906)12:00:22
time flies 

软英171周仙龙(1748153603)12:00:50
201732120130 

好为人师的我(984456043)12:01:01
201732120111 

软英171郑洪宇(1633787262)12:02:39
201732120128 

201732120168_Golden(2984538488)12:02:39
201732120168 

Npl.(593635848)12:07:02
201732120121 

tarmom(2104297320)12:15:21
201732120166 

201732120167 Clive妈妈(3321692247)12:16:06
20173210167 

[Attendance from the IRC channel #spm]

- Hui joined
  
- MY_REAL_NAME joined
  
<lanhui>Hi guys.  Let's wait for five minutes for more people to come.

<lanhui whispers to MY_REAL_NAME>Please change your nick name using the following command: /nick MyRealName

<lanhui whispers to MY_REAL_NAME>Replace MyRealName with your real name.

- MY_REAL_NAME is now known as Ashly_2016321201
  
- ALBOROMWARD joined
  
<lanhui>Thanks for joining #spm channel.

- MYRealName joined
  
<lanhui>You guys don't have QQ?

<Ashly_2016321201>we have

<MYRealName>I have it

<Ashly_2016321201>we are in the group too

- MyRealName15 joined
  
<ALBOROMWARD>hello world

<ALBOROMWARD>i'm in

- YEBOAH joined
  
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- MyRealName15 is now known as JESSICA201731220
  
- JESSICA201731220 is now known as JESSICA20133
  
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<JESSICA20133>Helloooo... anyone there?

<Ashly_2016321201>we are using QQ now

<JESSICA20133>i thought it was both. i wanted to see how this works..

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<Mohamed201732120>My student I.D : 201732120165

<Mohamed201732120>since it's not fully shown in the list

<Mohamed201732120>201732120165

<Mohamed201732120>I'm here lanhui

<Mohamed201732120>can't join QQ

<lanhui>OK.

<lanhui>What is your student number?

<Mohamed201732120>201732120165

<lanhui>Hi guys. Please write  your student number below.

<lanhui>I will post our lecture script later.

<Mohamed201732120>201732120165

<Mohamed201732120>OK 



Afternoon section
-----------------

*Feature creep - Asynchronous communication - Benefits of open source - Reap the benetifs - Don't throw away your code* 

2020-02-24 14:27:31 系统消息(10000)
Twizere Pacifique 唐平加入本群。

2020-02-24 14:28:27 系统消息(10000)
Nicole Rutagengwa 加入本群。

2020-02-24 14:46:34 系统消息(10000)
mcprizo加入本群。

2020-02-24 14:46:34 Kumson爸爸(3157209053)
大家好，我是Kumson的爸爸。

2020-02-24 15:34:53 NGOUNOU家长(438499151)
大家好，我是NGOUNOU 201925800180

2020-02-24 15:40:32 Lan Hui(1348141770)  Hi guys.  Welcome.

2020-02-24 15:40:40 Lan Hui(1348141770)  Where are other guys?  Mary Doe?  Mohamed Moummou?

2020-02-24 15:40:44 Nicole Rutagengwa (1403962700)
hey sir

2020-02-24 15:40:53 Nicole Rutagengwa (1403962700)
thank you 

2020-02-24 15:41:09 Nicole Rutagengwa (1403962700)
i will try to remind them again

2020-02-24 15:41:15 Lan Hui(1348141770)  We will start in 5 minutes.

2020-02-24 15:41:34 Lan Hui(1348141770)  Everyone here living in Beijing time?

2020-02-24 15:41:55 Kumson爸爸(3157209053)
okay sir

2020-02-24 15:42:16 Lan Hui(1348141770)  It turns out that people like QQ more. 

2020-02-24 15:42:28 Nicole Rutagengwa (1403962700)
momo went back home 

2020-02-24 15:42:44 Nicole Rutagengwa (1403962700)
maybe not beijing time 

2020-02-24 15:43:50 Lan Hui(1348141770)  How about Youma and Corneille?

2020-02-24 15:45:16 Lan Hui(1348141770)  Online learning may be less effective than classroom learning.

2020-02-24 15:45:23 Lan Hui(1348141770)  Maybe.  I am not sure.

2020-02-24 15:45:30 Lan Hui(1348141770)  I like online learning more.

2020-02-24 15:45:51 Lan Hui(1348141770)  One hard part is verification and authentication.

2020-02-24 15:46:03 Lan Hui(1348141770)  How do I know you are who you are.

2020-02-24 15:46:08 Nicole Rutagengwa (1403962700)
qq is better atleast most of us can access it 

2020-02-24 15:46:37 Lan Hui(1348141770)  Where were we left last time?

2020-02-24 15:46:56 Lan Hui(1348141770)  We've talked about feature creep and proprietary software.

2020-02-24 15:47:15 Lan Hui(1348141770)  Uncontrolled feature creep is really bad.

2020-02-24 15:47:20 Nicole Rutagengwa (1403962700)
i don't know because i couldn.t connect myself

2020-02-24 15:47:35 Lan Hui(1348141770)  It could make your team unable to deliver product on time.

2020-02-24 15:47:37 Nicole Rutagengwa (1403962700)
can we have a video meeting sir?

2020-02-24 15:47:44 Nicole Rutagengwa (1403962700)
or audio

2020-02-24 15:47:47 Lan Hui(1348141770)  No video meeting.  I don't like that.

2020-02-24 15:47:59 Lan Hui(1348141770)  I tried Zoom.  Did not work out very well.

2020-02-24 15:48:09 Lan Hui(1348141770)  

2020-02-24 15:48:12 Nicole Rutagengwa (1403962700)
because chatting is really uncomfortable

2020-02-24 15:48:45 Lan Hui(1348141770)  My sound appears distorted.

2020-02-24 15:49:21 Lan Hui(1348141770)  On the contrary, I think chatting is OK.  Most professionals like chatting.

2020-02-24 15:49:31 Lan Hui(1348141770)  If we could do face-to-face, then do face-to-face.

2020-02-24 15:49:42 Lan Hui(1348141770)  If not, text is far better than video streaming.

2020-02-24 15:49:44 Kumson爸爸(3157209053)
[表情][表情]

2020-02-24 15:49:58 Nicole Rutagengwa (1403962700)
but honestly i think then its just better to read the lectures

2020-02-24 15:50:14 Lan Hui(1348141770)  That is one part.

2020-02-24 15:50:24 Nicole Rutagengwa (1403962700)
because i don.t see us have class while chatting[表情]

2020-02-24 15:50:26 Lan Hui(1348141770)  Reading the lecture notes is useful.

2020-02-24 15:50:44 Lan Hui(1348141770)  Being here is also useful, at least for me.  I have to be here, according to the school policy.

2020-02-24 15:51:12 Nicole Rutagengwa (1403962700)
could you please accept MArie request

2020-02-24 15:51:19 Lan Hui(1348141770)  I think Kumson is someone who will report to the college?

2020-02-24 15:51:23 Nicole Rutagengwa (1403962700)
she wants to join

2020-02-24 15:51:28 系统消息(10000)
Marie加入本群。

2020-02-24 15:51:43 Kumson爸爸(3157209053)
hahahahah why do you think so sir ??

2020-02-24 15:52:00 Lan Hui(1348141770)  Just guess.

2020-02-24 15:52:11 Kumson爸爸(3157209053)
I am very okay with you uploading the lectures on the course platform and giving the tasks to perform

2020-02-24 15:52:15 Kumson爸爸(3157209053)
that's much better 

2020-02-24 15:52:54 Lan Hui(1348141770)  Anyway, please feel comfortable.  Slow down.

2020-02-24 15:53:00 Marie(2928285277)
Hello Sir

2020-02-24 15:53:10 Kumson爸爸(3157209053)
due to the fact we are unable to have live streaming (which most students would have preferred), also taking into consideration the time difference for those of us back home and mainland

2020-02-24 15:53:25 Kumson爸爸(3157209053)
it's just 8Am here 

2020-02-24 15:54:05 Lan Hui(1348141770)  Thanks.  Will consider that.  

2020-02-24 15:54:33 Lan Hui(1348141770)  I usually take attendance in the middle of the lecture.

2020-02-24 15:54:41 Lan Hui(1348141770)  What are we going to cover today? 

2020-02-24 15:54:45 Kumson爸爸(3157209053)
or you just shrink the readings into a ppt or whatever way works for you 

2020-02-24 15:54:52 Lan Hui(1348141770)  I will cover open source and Netscape.

2020-02-24 15:55:49 Lan Hui(1348141770)  I have posted readings on our course home page.  The current one is about Netscape.

2020-02-24 15:55:57 Nicole Rutagengwa (1403962700)
another student

2020-02-24 15:56:05 Lan Hui(1348141770)  It actually includes a set of readings.

2020-02-24 15:56:09 Nicole Rutagengwa (1403962700)
wants to join please accept her request

2020-02-24 15:56:21 Kumson爸爸(3157209053)
okay then . let's work according to information on our course homepage 

2020-02-24 15:56:46 Kumson爸爸(3157209053)
maybe attendance could be taken by noting those who submit tasks on time 

2020-02-24 15:56:52 Kumson爸爸(3157209053)
or within the deadline 

2020-02-24 15:57:10 Lan Hui(1348141770)  [图片]

2020-02-24 15:57:23 Lan Hui(1348141770)  The above screenshot shows your current reading task.

2020-02-24 15:57:44 Lan Hui(1348141770)  I will consider that.  

2020-02-24 15:58:15 Lan Hui(1348141770)  Actually I prefer asynchronous communication when we are physically separated.

2020-02-24 15:58:20 Kumson爸爸(3157209053)
okay sir

2020-02-24 15:59:10 Lan Hui(1348141770)  [图片]

2020-02-24 15:59:18 Nicole Rutagengwa (1403962700)
what is asychronous sir?

2020-02-24 15:59:18 Lan Hui(1348141770)  We are on the above slide.

2020-02-24 15:59:35 Lan Hui(1348141770)  Who can explain that?

2020-02-24 15:59:52 Lan Hui(1348141770)  Asychronous: (of two or more objects or events) not existing or happening at the same time.

2020-02-24 15:59:58 Lan Hui(1348141770)  Bing Dictionary.

2020-02-24 16:00:16 Lan Hui(1348141770)  What we are doing now is synchronous.

2020-02-24 16:00:41 Lan Hui(1348141770)  Email is generally considered as an asynchronous communication method.

2020-02-24 16:00:48 Lan Hui(1348141770)  Chatting - synchronous.

2020-02-24 16:01:08 Lan Hui(1348141770)  Things like video conferencing are all synchronous.

2020-02-24 16:01:29 Nicole Rutagengwa (1403962700)
ohh okay 

2020-02-24 16:01:38 Nicole Rutagengwa (1403962700)
i get it thanks 

2020-02-24 16:02:03 Nicole Rutagengwa (1403962700)
some students still waiting for request confirmation sir

2020-02-24 16:02:06 Lan Hui(1348141770)  Open source now is a trend.  Everyone talks about it.  Even Microsoft people have started embracing it.

2020-02-24 16:02:34 Lan Hui(1348141770)  (Are they sure they are entering the correct QQ Group?)

2020-02-24 16:03:35 Lan Hui(1348141770)  Microsoft Edge, for example, used the Chromium core (which is open source).

2020-02-24 16:03:59 Nicole Rutagengwa (1403962700)
i think so

2020-02-24 16:04:36 Lan Hui(1348141770)  Contrary to proprietary code, open source code can usually be included in our product (for profit) without causing too many worries.

2020-02-24 16:05:24 Lan Hui(1348141770)  (Ask them to scan the QR code to join.  I could not see their join requests.)

2020-02-24 16:05:46 Nicole Rutagengwa (1403962700)
done sir

2020-02-24 16:06:12 Lan Hui(1348141770)  Guys. Let's take a break (5 minutes).

2020-02-24 16:06:38 Nicole Rutagengwa (1403962700)
ok

2020-02-24 16:07:27 Marie(2928285277)
ok

2020-02-24 16:08:46 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
ok

2020-02-24 16:09:00 NGOUNOU家长(438499151)
ok

2020-02-24 16:09:57 系统消息(10000)
Twizere Pacifique 唐平邀请Guedalia Youma 加入了本群。

2020-02-24 16:10:09 系统消息(10000)
Twizere Pacifique 唐平邀请Tabitha加入了本群。

2020-02-24 16:11:15 Lan Hui(1348141770)  Move on.

2020-02-24 16:12:10 Lan Hui(1348141770)  What are the benefits of Open Source?

2020-02-24 16:12:22 Lan Hui(1348141770)  Different people have different answers.  

2020-02-24 16:13:00 Lan Hui(1348141770)  If you are an educational entity (e.g., university), making open source projects can give you more publicity.

2020-02-24 16:14:09 Lan Hui(1348141770)  For educational institutions, using open source software has a moral benefit, too.

2020-02-24 16:14:36 Lan Hui(1348141770)  "Schools have a social mission".

2020-02-24 16:14:40 Lan Hui(1348141770)  https://www.gnu.org/education/edu-schools.en.html

2020-02-24 16:15:14 Lan Hui(1348141770)  "Proprietary software is the enemy of the spirit of education".

2020-02-24 16:15:24 Lan Hui(1348141770)  I think the above statement is a bit too extreme.

2020-02-24 16:16:18 Lan Hui(1348141770)  The main problem or characteristic of proprietary software is that it prevents people from using it in their work (products).

2020-02-24 16:17:00 Lan Hui(1348141770)  For example, a few days before their major release,  they (the Netscape team) noticed that their code depended on Apple's code! 

2020-02-24 16:17:31 Lan Hui(1348141770)  Apple's code is mostly proprietary.

2020-02-24 16:17:46 Lan Hui(1348141770)  So the team had to beg Apple for permission to use their code. 

2020-02-24 16:17:53 Lan Hui(1348141770)  Apple said: "No."

2020-02-24 16:18:08 Lan Hui(1348141770)  The Netscape team then had to re-write that part overnight. 

2020-02-24 16:19:06 Lan Hui(1348141770)  When you want to sell millions of copies of your product (which includes Proprietary code, even just a little) to make profit, then you are going to have headaches. 

2020-02-24 16:20:07 Lan Hui(1348141770)  As a project manager, you should know different kinds of licenses really well.

2020-02-24 16:20:39 Lan Hui(1348141770)  If you want to use a piece of software (code) from elsewhere, study its terms and conditions.

2020-02-24 16:21:20 Lan Hui(1348141770)  If the license is not friendly, you'd better look for an open source alternative, or take the pain to write things by yourself.

2020-02-24 16:21:58 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
i have a question 

2020-02-24 16:22:22 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
can i ask ?

2020-02-24 16:22:43 Lan Hui(1348141770)  Of course.  In the future, you can just type your question without asking.

2020-02-24 16:22:53 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
okay 

2020-02-24 16:23:21 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
Like on Windows , when we publish a .exe  file , meaning that the source codes can not be seen , so how do they know that you used their codes ?

2020-02-24 16:23:53 Lan Hui(1348141770)  Reverse engineering.

2020-02-24 16:24:16 Lan Hui(1348141770)  The binary file contains some tag information (I think).

2020-02-24 16:24:36 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
ooh okay 

2020-02-24 16:24:48 Lan Hui(1348141770)  BTW, you seldom want to do that, because that is very inflexible.

2020-02-24 16:25:26 Lan Hui(1348141770)  Move on.  If you don't have enough hands, you may also consider making your project open source.

2020-02-24 16:25:58 Lan Hui(1348141770)  In other words, if your project is dying, just as Netscape was in 1998,

2020-02-24 16:26:23 Lan Hui(1348141770)  you may hope that the wider world could help you.

2020-02-24 16:26:44 Lan Hui(1348141770)  So you give away your source code for free.

2020-02-24 16:27:42 Lan Hui(1348141770)  But just as Jamie Zawinski (a former Software Engineer at Netscape) pointed out:

2020-02-24 16:27:55 Lan Hui(1348141770)  "you can't take a dying project, sprinkle it with the magic pixie dust of open source, and have everything magically work out. Software is hard. The issues aren't that simple."

2020-02-24 16:29:08 Lan Hui(1348141770)  Even if you make your software open source, chances are that nobody will care.

2020-02-24 16:29:41 Lan Hui(1348141770)  "For whatever reason, the project was not adopted by the outside.  It remained a Netscape (i.e., in-house) project. "

2020-02-24 16:30:34 Marie(2928285277)
Is that after they made it open?

2020-02-24 16:31:15 Lan Hui(1348141770)  The lesson I learned is that I cannot expect that a dying project will suddenly gain life a few weeks after displaying its source code to the public.  No way.

2020-02-24 16:31:52 Lan Hui(1348141770)  Netscape became Mozilla Firefox (much better now, still a bit struggling).

2020-02-24 16:32:02 Lan Hui(1348141770)  ===============================

2020-02-24 16:32:10 Lan Hui(1348141770)  Let's take a 5-minute break.

2020-02-24 16:40:07 Lan Hui(1348141770)  ===============================

2020-02-24 16:40:10 Lan Hui(1348141770)  Move on.

2020-02-24 16:40:19 Lan Hui(1348141770)  Business model is really important.

2020-02-24 16:40:44 Lan Hui(1348141770)  Business model is crucial if you have (strong) competitors.

2020-02-24 16:41:11 Lan Hui(1348141770)  Like QQ, it does not charge average people anything.

2020-02-24 16:41:56 Lan Hui(1348141770)  Remember: to make QQ run, the company Tencent needs to pay bills on servers and electricity.

2020-02-24 16:42:26 Lan Hui(1348141770)  The demand of servers and electricity is much higher for video conferencing services.

2020-02-24 16:42:56 Lan Hui(1348141770)  How to get enough money to offset the "free of charge" cost here?  

2020-02-24 16:43:11 Lan Hui(1348141770)  Frankly, I am not quite sure.

2020-02-24 16:43:37 Lan Hui(1348141770)  Maybe the company could make profit from other avenues, e.g., games, advertisements, social influence, government funds, etc. 

2020-02-24 16:44:30 Lan Hui(1348141770)  The more people use your product, the easier it is to convince venture capital.

2020-02-24 16:45:24 Lan Hui(1348141770)  How about the business model of open source?

2020-02-24 16:46:09 Lan Hui(1348141770)  Two things I can imagine are More Publicity and Reap the Benefits.

2020-02-24 16:47:06 Lan Hui(1348141770)  [图片]

2020-02-24 16:47:57 Lan Hui(1348141770)  Sometimes it is good Just to let outsider know you are doing something.

2020-02-24 16:48:29 Lan Hui(1348141770)  The outsider (e.g., funding agencies) would then consider giving you opportunities.

2020-02-24 16:49:01 Lan Hui(1348141770)  The opportunities can be in the form of direct funding, or contracts.

2020-02-24 16:49:41 Lan Hui(1348141770)  Quite similar to fans in social media.

2020-02-24 16:49:50 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
Wow Interesting 

2020-02-24 16:50:28 Lan Hui(1348141770)  If you have 1 million fans, then you have a big social impact.

2020-02-24 16:50:46 Lan Hui(1348141770)  Reap the benefits.

2020-02-24 16:50:52 Lan Hui(1348141770)  Hiring people is expensive.

2020-02-24 16:51:28 Lan Hui(1348141770)  Let's reap the stuff done by other companies, by just paying a few employees in my company to join that open source project.

2020-02-24 16:52:29 Lan Hui(1348141770)  Microsoft reaped the chromium project.

2020-02-24 16:52:40 Lan Hui(1348141770)  The Edge browser is an example.

2020-02-24 16:53:12 Lan Hui(1348141770)  Microsoft abandoned IE which they had been actively developing for almost 20 years!

2020-02-24 16:53:34 Lan Hui(1348141770)  Microsoft is good at strategy.  Not just programming skills.

2020-02-24 16:53:53 Lan Hui(1348141770)  Huawei reaped Hadoop.

2020-02-24 16:54:05 Lan Hui(1348141770)  Ubuntu reaped Debian.

2020-02-24 16:54:13 Lan Hui(1348141770)  So on, so forth.

2020-02-24 16:54:53 Lan Hui(1348141770)  [图片]

2020-02-24 16:55:37 Lan Hui(1348141770)  There must be Big Reasons behind the open source movement (in the software industry).  I mentioned two of them.  I don't think I know all the reasons.

2020-02-24 16:55:50 Lan Hui(1348141770)  We could explore more in the future.

2020-02-24 16:56:08 Lan Hui(1348141770)  Opening up your project is not an easy task.

2020-02-24 16:56:22 Lan Hui(1348141770)  If it were easy, Netscape would have succeeded in doing that.

2020-02-24 16:56:45 Lan Hui(1348141770)  Netscape had millions of lines of code.  That amount could scare people away.

2020-02-24 16:57:22 Lan Hui(1348141770)  How could an outsider understand such a huge codebase?

2020-02-24 16:58:10 Lan Hui(1348141770)  A major challenge is to let outsiders understand your project.

2020-02-24 16:58:20 Lan Hui(1348141770)  If they could understand part of the code, it would be great.

2020-02-24 16:58:28 Lan Hui(1348141770)  Don't expect too much on that in a short period of time.

2020-02-24 16:59:01 Lan Hui(1348141770)  In the first couple of months, an interested outsider probably cannot contribute any line of code.

2020-02-24 16:59:37 Lan Hui(1348141770)  That is quite normal.  He may ask a few questions, most of which you already know too well and have answered many times (boring and seemingly counter-productive).

2020-02-24 17:00:12 Lan Hui(1348141770)  BTW, an outsider does not have to contribute Code in order to contribute to the Project.

2020-02-24 17:00:35 Lan Hui(1348141770)  Sometimes, just some positive feedback, some suggestions, or directions, are really helpful.

2020-02-24 17:01:02 Lan Hui(1348141770)  Anyway, you need to set up many things before you can open source your project.

2020-02-24 17:01:22 Lan Hui(1348141770)  Less work if you just keep the project in-house!

2020-02-24 17:01:46 Lan Hui(1348141770)  Does not hurt your image when your code is really lousy if it is private.

2020-02-24 17:02:06 Lan Hui(1348141770)  ===============================

2020-02-24 17:02:15 Lan Hui(1348141770)  Five minutes break.

2020-02-24 17:03:07 Marie(2928285277)
ok

2020-02-24 17:05:24 Lan Hui(1348141770)  ===============================

2020-02-24 17:05:37 Lan Hui(1348141770)  [图片]

2020-02-24 17:06:04 Lan Hui(1348141770)  Competition between Netscape Communications and Microsoft.

2020-02-24 17:06:27 Lan Hui(1348141770)  [图片]

2020-02-24 17:06:42 Lan Hui(1348141770)  [图片]

2020-02-24 17:07:10 Lan Hui(1348141770)  One big mistake Netscape made is throwing away their old code and trying to start from scratch.

2020-02-24 17:07:18 Lan Hui(1348141770)  A Really bad decision.

2020-02-24 17:07:40 Lan Hui(1348141770)  Code always looks quite messy, old or new.

2020-02-24 17:07:51 Lan Hui(1348141770)  DON'T THROW AWAY YOUR CODE.

2020-02-24 17:08:39 Lan Hui(1348141770)  Never throw your code (which has cost you tons of money, enormous time, many sleepless nights, etc) in the commercial world.

2020-02-24 17:09:32 Lan Hui(1348141770)  Live with messy code and make it better each day,

2020-02-24 17:09:43 Lan Hui(1348141770)  instead of furiously throwing it away.

2020-02-24 17:09:58 Lan Hui(1348141770)  That is pretty much for today.  

2020-02-24 17:10:35 Lan Hui(1348141770)  Read this article on Not Throwing Old Code after class.  https://www.joelonsoftware.com/2000/04/06/things-you-should-never-do-part-i/

2020-02-24 17:10:44 Lan Hui(1348141770)  ===============================

2020-02-24 17:10:58 Lan Hui(1348141770)  Now I am taking attendance.  Please reply with your student number.

2020-02-24 17:11:24 NGOUNOU家长(438499151)
201925800180

2020-02-24 17:11:28 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
201925800174

2020-02-24 17:11:35 Marie(2928285277)
201925800173

2020-02-24 17:11:36 Nicole Rutagengwa (1403962700)
201925800169

2020-02-24 17:12:06 系统消息(10000)
Guedalia Youma 撤回了一条消息

2020-02-24 17:12:43 Guedalia Youma (3014432207)
201925800221



Monday, 2 March 2020
====================

Morning section
---------------

*Free and open source - FOSS - Four Freedoms - Closed-source - Proprietary licenses - Reluctance to welcome free software - Linux - Continuous improvement - User to developer ratio - Overhead in the beginning - Metcalfe's Law - 30 years of development*

2020-03-02 10:35:08 蓝老师(1348141770) ===================================================

2020-03-02 10:35:12 蓝老师(1348141770) Morning guys.

2020-03-02 10:35:32 201732120134_Michelle(3304952232) morning 老师

2020-03-02 10:35:39 张滨(2350711965) Morning

2020-03-02 10:35:40 Saeed : 201732120146(446571011) goood morning

2020-03-02 10:35:41 杰西卡(2422938906)  早上好

2020-03-02 10:35:44 蓝老师(1348141770) Could you type your student number?

2020-03-02 10:35:52 张滨(2350711965) 201732120127

2020-03-02 10:35:56 Saeed : 201732120146(446571011) 201732120146

2020-03-02 10:35:56 201732120134_Michelle(3304952232) 201732120134

2020-03-02 10:35:57 201732120135 玛莎(3534763826) 201732120135

2020-03-02 10:36:03 杰西卡(2422938906) 201732120133

2020-03-02 10:36:06 软英171郑洪宇(1633787262) 201732120128

2020-03-02 10:36:10 201632120150-Ashly(1661411131) 201632120150

2020-03-02 10:36:11 Tarmom 201732120166(2104297320) 201732120166

2020-03-02 10:36:23 ALBOROM WARD-201732120143家长(3279308836) 201732120143

2020-03-02 10:36:32 LUL GUOBA RUOT (2217724540) 201632120161

2020-03-02 10:36:33 软英171陈伟超(937202326) 201732120113

2020-03-02 10:36:37 李佳兴(421281726) 201732120118

2020-03-02 10:36:43 ibrahim(1525200991) 201732120159

2020-03-02 10:36:51 郑晓钰(280768265) 201732120110

2020-03-02 10:36:54 叶涵涛(2289316051) 201732120125

2020-03-02 10:37:36 蓝老师(1348141770) Let's wait 3 minutes for more people to join in.

2020-03-02 10:38:14 201732120168_Golden(2984538488) 201732120168

2020-03-02 10:38:18 蓝老师(1348141770) I plan to deliver a pop-up quiz next time, for quiz 3, during the lecture.

2020-03-02 10:38:50 201732120141--AHAMED SABUJ妈妈(2686217157) 201732120141

2020-03-02 10:39:36 1n(2835813510) 201732120102

2020-03-02 10:39:41 201732120151 Barkay sanoussi(3178573723) 201732120151

2020-03-02 10:40:21 蓝老师(1348141770) OK

2020-03-02 10:40:24 ibrahim(1525200991) By next time you mean today or next class ?

2020-03-02 10:40:38 201732120157 hossain arif<charif19282@qq.com> 201732120157

2020-03-02 10:40:42 蓝老师(1348141770) Yes.  Next Monday, lecture time.

2020-03-02 10:40:47 软英171戴泽荣(975336710) 201732120115

2020-03-02 10:40:49 ibrahim(1525200991) OK

2020-03-02 10:41:28 蓝老师(1348141770) That is my trick to keep you online and stay attentive.

2020-03-02 10:42:13 蓝老师(1348141770) [图片]

2020-03-02 10:42:43 软英171周仙龙(1748153603) 201732120130

2020-03-02 10:42:45 蓝老师(1348141770) What does free and open source software, sometimes called FOSS, mean?

2020-03-02 10:43:15 蓝老师(1348141770) The two terms "free" and "open source" are nowadays interchangeable.

2020-03-02 10:43:29 蓝老师(1348141770) The notion "free" comes before "open source".

2020-03-02 10:44:14 蓝老师(1348141770) If something is free and open source, it means you can reap other people's fruit.

2020-03-02 10:44:25 蓝老师(1348141770) Usually.

2020-03-02 10:44:36 蓝老师(1348141770) Free of charge.

2020-03-02 10:45:40 蓝老师(1348141770) Any one knows any FOSS application that requires you to pay?

2020-03-02 10:45:50 蓝老师(1348141770) I don't know any.

2020-03-02 10:46:20 蓝老师(1348141770) Free and open source are mostly about licenses.  A bit history on software licenses.

2020-03-02 10:46:59 蓝老师(1348141770) In the beginning (60's and 70's), software were usually free.

2020-03-02 10:47:24 蓝老师(1348141770) The users were mostly professionals from research labs and universities.

2020-03-02 10:47:46 蓝老师(1348141770) BTW, at that time, very people could afford a mainframe.

2020-03-02 10:48:00 蓝老师(1348141770) Personal computers are a much later story.

2020-03-02 10:48:45 蓝老师(1348141770) Although these software might not be explicitly labeled as free, in practice they allowed a large degree of freedom in running, study, sharing and modification.

2020-03-02 10:49:28 蓝老师(1348141770) After that, hardware vendors and software vendors began to separate.

2020-03-02 10:49:53 蓝老师(1348141770) Software vendors started to charge people by using their software,

2020-03-02 10:50:15 蓝老师(1348141770) which is perfectly OK because they had spent money on developing them.

2020-03-02 10:51:09 蓝老师(1348141770) Big companies like IBM, Microsoft, Hewlett-Packard (HP), Apple and MATLAB began to make commercial software.

2020-03-02 10:51:27 蓝老师(1348141770) Commercial software are mostly proprietary.

2020-03-02 10:52:15 蓝老师(1348141770) These software are usually shipped with rather strict licenses.

2020-03-02 10:52:43 陈真赐(1312502742) 201732120114

2020-03-02 10:52:43 软英171 郑可富(1924773187) 201732120129

2020-03-02 10:53:05 蓝老师(1348141770) Users need to comply with the proprietary licenses before they can lawfully use these software.

2020-03-02 10:54:04 Samantha 201632120140(2459455104) 201632120140
   
2020-03-02 10:54:17 蓝老师(1348141770) These licenses do not allow people to read the source code or modify the source code.

2020-03-02 10:54:51 蓝老师(1348141770) (Thanks for your information, Sabuj.  That is true.)

2020-03-02 10:55:26 蓝老师(1348141770) To counter this, Richard Stallman started the Free Software Movement.

2020-03-02 10:55:51 蓝老师(1348141770) Of course, this movement was not endorsed by most proprietary software companies.

2020-03-02 10:56:22 蓝老师(1348141770) Richard Stallman emphasizes on Four essential freedoms.

2020-03-02 10:57:06 蓝老师(1348141770) Perhaps he was trying to re-establish his gold old days at MIT.

2020-03-02 10:57:42 蓝老师(1348141770) Four Essential Freedoms - run, study, modify and redistribute.

2020-03-02 10:58:01 蓝老师(1348141770) Commercial companies definitely don't want to do that.

2020-03-02 10:58:20 蓝老师(1348141770) One Big reason is that if they do, they give their competitors advantages.

2020-03-02 10:59:09 蓝老师(1348141770) Their competitors could steal their code and make it better to have an advantage.

2020-03-02 11:00:16 蓝老师(1348141770) If I run a commercial company, I won't ask my employees use GPL licenses.

2020-03-02 11:00:38 蓝老师(1348141770) I would like to keep my code in a safe place.

2020-03-02 11:01:23 蓝老师(1348141770) Perhaps my customers (e.g., banks) don't want to use GPL either, because they have sensitive data and implementation that they would rather keep confidential.

2020-03-02 11:01:34 蓝老师(1348141770) Let's take a 5-minute break.

2020-03-02 11:01:51 软英171 吕伊豪(745291576) 201732120120

2020-03-02 11:02:33 软英171包振丰(984456043) 201732120111

2020-03-02 11:05:22 蓝老师(1348141770) ===================================================

2020-03-02 11:05:26 蓝老师(1348141770) Move on.

2020-03-02 11:06:45 蓝老师(1348141770) If I ask you, proprietary software are always closed-source software, is that true?

2020-03-02 11:07:09 蓝老师(1348141770) Anyone?

2020-03-02 11:07:22 nainezz(2407048879) 201732120173

2020-03-02 11:07:25 软英171郑洪宇(1633787262) yes

2020-03-02 11:07:32 ALBOROM WARD-201732120143家长(3279308836) yes

2020-03-02 11:07:33 系统消息(10000) 201732120135 玛莎撤回了一条消息

2020-03-02 11:07:34 Saeed : 201732120146(446571011) yes

2020-03-02 11:07:41 软英171周仙龙(1748153603) yes

2020-03-02 11:07:41 蓝老师(1348141770) False.

2020-03-02 11:07:46 蓝老师(1348141770) I think it is false.

2020-03-02 11:08:09 蓝老师(1348141770) You can read proprietary software's source code.  No problem.

2020-03-02 11:09:20 蓝老师(1348141770) But since the license is proprietary, then if you try to sell your product that includes that piece of code, you infringe on the company's copyright.

2020-03-02 11:09:27 软英171周仙龙(1748153603) but how to read its source code？

2020-03-02 11:10:45 蓝老师(1348141770) I could show my code to you but the code comes with a proprietary license.

2020-03-02 11:11:26 蓝老师(1348141770) The license says something like "Oh, you could read my code but you could not sell my code in your product."

2020-03-02 11:12:12 蓝老师(1348141770) Done.  In terms of Four Freedoms, I don't give you the freedom to redistribute it.

2020-03-02 11:12:25 蓝老师(1348141770) You can study it, no problem.

2020-03-02 11:13:21 蓝老师(1348141770) [图片]

2020-03-02 11:13:50 蓝老师(1348141770) In a school setting, I agree with Richard Stallman.

2020-03-02 11:14:12 蓝老师(1348141770) We should encourage students and professors to use FOSS.

2020-03-02 11:14:16 蓝老师(1348141770) Why?

2020-03-02 11:14:33 蓝老师(1348141770) School is a place for learning, and FOSS is perfect for that purpose.

2020-03-02 11:15:15 蓝老师(1348141770) School is also a place for moral formation, where we teach people the value of sharing and contributing.

2020-03-02 11:15:46 蓝老师(1348141770) You could read the article `Why Schools Should Exclusively Use Free Software`_.

.. _Why Schools Should Exclusively Use Free Software: https://www.gnu.org/education/edu-schools.en.html

2020-03-02 11:15:54 蓝老师(1348141770) I agree with every point the author made.

2020-03-02 11:17:39 蓝老师(1348141770) Industry people and commercial companies seem to like the term "open source" more than "free".

2020-03-02 11:18:03 蓝老师(1348141770) "Free" emphasizes an social ideology,

2020-03-02 11:18:15 蓝老师(1348141770) while "open source" is more practical.

2020-03-02 11:18:49 蓝老师(1348141770) Anyway, most free software are open source and most open source software are free.  There is a big overlap.

2020-03-02 11:19:14 蓝老师(1348141770) The difference is on the emphasis.

2020-03-02 11:19:41 蓝老师(1348141770) One on Value, the other on Utility.

2020-03-02 11:20:09 蓝老师(1348141770) [图片]

2020-03-02 11:20:42 蓝老师(1348141770) If you open source your project, don't expect too much in the short term.

2020-03-02 11:21:14 蓝老师(1348141770) Usually it means you should be a more disciplined developer,

2020-03-02 11:21:37 蓝老师(1348141770) because you show your "face" to the public.

2020-03-02 11:22:46 蓝老师(1348141770) "Wash your face", although takes some work, is still a good idea in general.

2020-03-02 11:23:04 蓝老师(1348141770) Let's take a 3-minute break.

2020-03-02 11:23:26 Saeed : 201732120146(446571011) ok

2020-03-02 11:24:24 ALBOROM WARD-201732120143家长(3279308836) Ok

2020-03-02 11:26:21 蓝老师(1348141770) ======================================================

2020-03-02 11:26:23 蓝老师(1348141770) [Announcement] Several things are due tonight.  Quiz 2.  Group information.  Don't miss that.

2020-03-02 11:26:57 201732120151 Barkay sanoussi(3178573723) @蓝老师 @蓝老师 hi teacher  each member should send a text file individually for the group  list or only the group  leader send, is enough

2020-03-02 11:27:18 蓝老师(1348141770) Just Group Leader.

2020-03-02 11:27:30 201732120151 Barkay sanoussi(3178573723) ok

2020-03-02 11:27:45 软英171高增(1520653544) my number：201732120117sorry，i forget login

2020-03-02 11:28:27 蓝老师(1348141770) Send me an email about that.

2020-03-02 11:28:51 蓝老师(1348141770) Pure overhead at the beginning if I wish to set up an open source project.

2020-03-02 11:29:11 蓝老师(1348141770) Fortunately, this overhead is not a waste of time.

2020-03-02 11:29:40 蓝老师(1348141770) Just like Test-driven Development requiring us to write test before implementation.

2020-03-02 11:29:54 蓝老师(1348141770) Test cases are useful anyway.

2020-03-02 11:31:15 蓝老师(1348141770) Things like project home page, discussion forum, bug tracker, version control system, documentation and automation tools are immensely useful for the project's health.

2020-03-02 11:31:59 蓝老师(1348141770) When I open up a project, I want to achieve two goals.

2020-03-02 11:32:04 蓝老师(1348141770) 1. Acquire users.  2. Acquire developers.

2020-03-02 11:32:24 蓝老师(1348141770) The more users, the better.

2020-03-02 11:32:42 蓝老师(1348141770) The number of users is proportional to the amount of influence.

2020-03-02 11:33:00 蓝老师(1348141770) QQ has tons of users.

2020-03-02 11:33:29 蓝老师(1348141770) Then a new social media user is forced to use QQ even if he has other options like IRC.

2020-03-02 11:34:02 蓝老师(1348141770) Here comes Metcalfe's Law.

2020-03-02 11:34:16 蓝老师(1348141770) Who is this guy?

2020-03-02 11:34:42 蓝老师(1348141770) If a guy's name is associated with a Law, usually he is a tremendously successful guy.

2020-03-02 11:34:52 蓝老师(1348141770) Don't you think so?

2020-03-02 11:35:35 蓝老师(1348141770) One association is good enough in a person's lifetime.

2020-03-02 11:35:47 蓝老师(1348141770) What does this law say?

2020-03-02 11:35:58 蓝老师(1348141770) The value of a network grows by the square of the size of the network.

2020-03-02 11:36:06 蓝老师(1348141770) That is exactly the case for QQ.

2020-03-02 11:36:54 蓝老师(1348141770) The second goal is to acquire developers.

2020-03-02 11:37:15 蓝老师(1348141770) Probably the main reason is that I don't have enough hands.

2020-03-02 11:37:42 蓝老师(1348141770) And I hope other people could help in the project.

2020-03-02 11:37:46 蓝老师(1348141770) Why should they help?

2020-03-02 11:38:00 蓝老师(1348141770) Sometimes for money.

2020-03-02 11:38:31 蓝老师(1348141770) If money is not immediately available, then for respect/reputation/fame.

2020-03-02 11:39:06 蓝老师(1348141770) In the early age of Linux, most developers are voluntary.

2020-03-02 11:39:48 蓝老师(1348141770) Of course, most of them are established developers with good income from their proprietary employers (companies or universities).

2020-03-02 11:40:43 蓝老师(1348141770) BTW, there is a documentary for Linux, *The Code*, which you could watch after class.

2020-03-02 11:40:45 蓝老师(1348141770) https://www.bilibili.com/video/av4242055/?spm_id_from=333.788.videocard.1

2020-03-02 11:41:37 蓝老师(1348141770) This documentary tells us how the Linux Project was managed.  It is a miracle.

2020-03-02 11:42:20 蓝老师(1348141770) Loosely connected guys work together and make something that works.

2020-03-02 11:43:33 蓝老师(1348141770) Linux started out in 1991 from something really small, LOC less than 1000?

2020-03-02 11:43:51 蓝老师(1348141770) Now? At least 1m LOC in the kernel.

2020-03-02 11:44:34 蓝老师(1348141770) [图片]

2020-03-02 11:45:52 蓝老师(1348141770) You could browse the code tree.

2020-03-02 11:45:59 蓝老师(1348141770) Let's take a 5-minute break.

2020-03-02 11:50:57 蓝老师(1348141770) =============================================

2020-03-02 11:51:10 蓝老师(1348141770) Linux is a crucial piece of FOSS.

2020-03-02 11:51:43 蓝老师(1348141770) Look at this, its original author Linus Torvalds is still contributing it.

2020-03-02 11:52:00 蓝老师(1348141770) Man, almost 30 years after its initial release.

2020-03-02 11:52:13 蓝老师(1348141770) Think about their efforts on continuous improvement.

2020-03-02 11:52:44 蓝老师(1348141770) These guys never throw away their code, never.

2020-03-02 11:53:01 蓝老师(1348141770) [图片]

2020-03-02 11:53:45 蓝老师(1348141770) User to developer ratio.  Bigger is better.

2020-03-02 11:54:14 蓝老师(1348141770) 1m users, 10 developers.  User developer ratio is 10,000.

2020-03-02 11:54:20 蓝老师(1348141770) Oh, sorry, 100,000.

2020-03-02 11:54:59 蓝老师(1348141770) 100 users, 1 developer. User to developer ratio is 100, one thousand times smaller.

2020-03-02 11:55:04 蓝老师(1348141770) 100 is the case for LRR.

2020-03-02 11:55:33 蓝老师(1348141770) [图片]

2020-03-02 11:56:14 蓝老师(1348141770) (We are moving very slowly.)

2020-03-02 11:56:22 蓝老师(1348141770) (Perhaps I may try sound.)

2020-03-02 11:56:34 蓝老师(1348141770) (But I doubt the effectiveness.)

2020-03-02 11:57:20 蓝老师(1348141770) It is hard to persuade average people on the long-term benefit of something.

2020-03-02 11:57:47 蓝老师(1348141770) Average people see things less than one week in the future.

2020-03-02 11:58:00 蓝老师(1348141770) That is actually good.

2020-03-02 11:58:13 蓝老师(1348141770) So people do not have worry too much.

2020-03-02 11:58:43 蓝老师(1348141770) That is everything for today.

2020-03-02 11:58:55 ibrahim(1525200991) OK

2020-03-02 11:59:01 蓝老师(1348141770) Now you need to start reading Chapter 2.

2020-03-02 11:59:02 蓝老师(1348141770) https://producingoss.com/en/getting-started.html

2020-03-02 11:59:30 蓝老师(1348141770) The pop-quiz will be from it.

2020-03-02 11:59:33 蓝老师(1348141770) 2 marks.

2020-03-02 11:59:41 蓝老师(1348141770) Next Monday.

2020-03-02 11:59:47 蓝老师(1348141770) ======================================================

2020-03-02 12:00:00 蓝老师(1348141770) Could you write your student number below?  Thanks. Bye.

2020-03-02 12:00:10 201732120135 玛莎(3534763826) 201732120135

2020-03-02 12:00:11 ibrahim(1525200991) 201732120159

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2020-03-02 12:01:20 系统消息(10000) hamunyela加入本群。

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armand(2431154023) 2020/3/2 14:04:00 201732120161



Afternoon section
-----------------

*Advantages and disadvantages of audio communication - A critical bug in LRR - Don't throw away your code - Old code - New code - Coopetition - Rhythm of releases*


Twizere Pacifique 唐平 15:04:00

Hello Teacher , I hope you are doing well 

I realized how Learning online has been a challenge to both the Teacher and students, I have suggestion about it 

My suggestion is that we use:
- Audio call (as a way of communication) and 
- Chats (to outline important points as we used the blackboard in class)

Why is Audio call Important ?
- It keeps students focused 
- It saves time (we can learn a lot)
- It simplifies communication

Why do i suggest that ?
- I realized that since we have taken your courses , Your teaching method is unique, It does not involve the use of PPT but rather blackboard , Which is a good thing as it is clear and flexible. so Audio + chats will match your teaching method.
- another thing is that students tend to be focused when there is a call than only chats

That's my suggestion.
Thank you and have a great day.

2020-03-02 15:31:25 Lan Hui(1348141770)  We will start at 3:40 and end at 5:10pm.

2020-03-02 15:34:04 Lan Hui(1348141770)  ==============================

2020-03-02 15:34:07 Lan Hui(1348141770)  Thanks for the suggestion about using audio. I don't think that will work out very well. Blackboard is great.  The point that blackboard is great is that it slows things down and give people more time to think and absorb knowledge.  But we do not have blackboard now.  You could do audio.  I will do text, at least for today.  I will do more research on how to teach effectively, online.  However, I could experiment with audio clip now (not real-time).

2020-03-02 15:34:09 Lan Hui(1348141770)  =======================================

2020-03-02 15:41:26 Lan Hui(1348141770)

2020-03-02 15:41:53 NGOUNOU家长(438499151)
hello Sir

2020-03-02 15:42:16 Lan Hui(1348141770)
2020-03-02 15:42:28 Guedalia Youma (3014432207)
Hello professor 

2020-03-02 15:42:54 Lan Hui(1348141770)  A downside of audio is that I cannot keep my script.

2020-03-02 15:44:19 Lan Hui(1348141770)  This becomes worse when I am not a native English speaker.

2020-03-02 15:45:06 Lan Hui(1348141770)  One drawback of text is that you can lose focus easily.

2020-03-02 15:45:35 Lan Hui(1348141770)  Because it is slow ...

2020-03-02 15:45:40 Lan Hui(1348141770)  That is fine.  

2020-03-02 15:45:57 Lan Hui(1348141770)  I don't know whether or not you are day dreaming, 

2020-03-02 15:46:22 Lan Hui(1348141770)  First of all, could you write your student number below?

2020-03-02 15:46:54 Lan Hui(1348141770)  As a form of taking attendance.

2020-03-02 15:47:02 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
201925800174

2020-03-02 15:47:27 NGOUNOU家长(438499151)
201925800180

2020-03-02 15:47:28 Lan Hui(1348141770)  [Announcement] Several things are due tonight: Quiz 2 and Group Information.  Don't miss that.

2020-03-02 15:47:46 Lan Hui(1348141770)  I'll go to grab a drink.

2020-03-02 15:49:06 Lan Hui(1348141770)  Guys. Please write your student number below. Thanks.

2020-03-02 15:49:18 Kumson爸爸(3157209053)
201925800166

2020-03-02 15:50:29 Lan Hui(1348141770)  I saw 8 out of 9 people are on the Member Panel.

2020-03-02 15:50:34 Lan Hui(1348141770)  Where are other guys?

2020-03-02 15:50:52 Guedalia Youma (3014432207)
201925800221

2020-03-02 15:50:57 Lan Hui(1348141770)  Where is Nicole?

2020-03-02 15:51:31 Lan Hui(1348141770)  Kumson, it is 8am at your location, isn't it?

2020-03-02 15:52:13 Kumson爸爸(3157209053)
yes it's 8:52AM

2020-03-02 15:52:32 Lan Hui(1348141770)  Not too bad.

2020-03-02 15:52:49 Lan Hui(1348141770)  In terms of group information, 

2020-03-02 15:53:48 Lan Hui(1348141770)  pacitwizere, NGOUNOU BERNARD, MOHAMED  MOUMMOU, KUMSON and Mary Doe have already submitted that information.

2020-03-02 15:54:36 Lan Hui(1348141770)  For other guys, please make sure you submit your group information by tonight (for the 3 easy marks).

2020-03-02 15:55:02 Lan Hui(1348141770)  None of you know PHP, don't you?

2020-03-02 15:55:11 Nicole Rutagengwa (1403962700)
I’m here 

2020-03-02 15:55:21 Nicole Rutagengwa (1403962700)
201925800169

2020-03-02 15:55:26 Lan Hui(1348141770)  Thanks Nicole.

2020-03-02 15:55:41 Lan Hui(1348141770)  Perhaps you could learn some basic PHP,

2020-03-02 15:55:47 Lan Hui(1348141770)  in the first few weeks?

2020-03-02 15:55:54 Nicole Rutagengwa (1403962700)
Sorry for the delay 

2020-03-02 15:55:59 Lan Hui(1348141770)  PHP is a really useful programming language,

2020-03-02 15:56:15 Lan Hui(1348141770)  particularly useful for web development.

2020-03-02 15:57:20 Lan Hui(1348141770)  A CRITICAL (even BLOCKER) bug in the current LRR is that a new user could not login immediately after sign up.  This is Really annoying because it prevents users from using LRR!

2020-03-02 15:57:53 Lan Hui(1348141770)  So I think the top priority will be fixing that.  A top 2 priority is that the password resetting link is not always sent successfully.  Below are the relevant bug reports: 

2020-03-02 15:58:07 Lan Hui(1348141770)  http://118.25.96.118/bugzilla/show_bug.cgi?id=49  http://118.25.96.118/bugzilla/show_bug.cgi?id=48  http://118.25.96.118/bugzilla/show_bug.cgi?id=19

2020-03-02 15:59:27 Lan Hui(1348141770)  First picture - failed to send the password resetting link.

2020-03-02 15:59:39 Lan Hui(1348141770)  Second picture - failed to login with correct password.

2020-03-02 15:59:55 Lan Hui(1348141770)  I believe some of you have encountered these problems last semester.

2020-03-02 16:00:59 Lan Hui(1348141770)  That is the project thing.  I think we have the best resources in learning software project management in China.

2020-03-02 16:01:35 Lan Hui(1348141770)  Now the coronavirus provides a Real opportunity for doing remote, collaborative software development.

2020-03-02 16:02:19 Lan Hui(1348141770)  "Prince is a programmer and a tester.  Mary is a documentation writer and a tester".

2020-03-02 16:02:31 Lan Hui(1348141770)  [图片]

2020-03-02 16:02:43 Lan Hui(1348141770)  Does that mean Kumson could do programming?

2020-03-02 16:03:11 Lan Hui(1348141770)  Kumson?

2020-03-02 16:03:19 Marie(2928285277)
201925800173

2020-03-02 16:03:28 Marie(2928285277)
Sorry for being late 

2020-03-02 16:03:43 Lan Hui(1348141770)  I feel that Twizere may be a programmer.

2020-03-02 16:04:03 Lan Hui(1348141770)  He could also be a documentation writer.

2020-03-02 16:04:14 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
@Lan Hui Yes Teacher I can do some programming 

2020-03-02 16:04:17 Lan Hui(1348141770)  He is able to write long and organized email.  A great ability.

2020-03-02 16:05:29 Lan Hui(1348141770)  BTW, we are going to have a pop-up quiz next Monday.

2020-03-02 16:05:54 Lan Hui(1348141770)  It is like a "surprise attack".

2020-03-02 16:06:11 Lan Hui(1348141770)  The content of the quiz won't be disclosed until the lecture time.

2020-03-02 16:06:26 Nicole Rutagengwa (1403962700)
@蓝珲@蓝珲 [表情]

2020-03-02 16:06:29 Lan Hui(1348141770)  You need to read Chapter 2 for preparing that quiz (2 marks there).

2020-03-02 16:06:45 Lan Hui(1348141770)  https://producingoss.com/en/getting-started.html

2020-03-02 16:07:00 Lan Hui(1348141770)  You have one week to read. 

2020-03-02 16:07:13 Lan Hui(1348141770)  In fact, I remember Nicole took my course before.

2020-03-02 16:07:22 Lan Hui(1348141770)  So you have an advantage.

2020-03-02 16:07:36 Lan Hui(1348141770)  However, I will add lots of new stuff, to be fair with others.

2020-03-02 16:08:09 Nicole Rutagengwa (1403962700)
Yes this time it’s seem to be different than last time 

2020-03-02 16:08:18 Nicole Rutagengwa (1403962700)
I had your course 

2020-03-02 16:08:51 Nicole Rutagengwa (1403962700)
Or maybe I don’t remember much  

2020-03-02 16:08:55 Lan Hui(1348141770)  I posted another video documentary (The Code) for you to watch after class.

2020-03-02 16:09:16 Lan Hui(1348141770)  Of course, I think Nicole has forgotten everything.  Me too.

2020-03-02 16:09:36 Lan Hui(1348141770)  Documentary The Code: https://www.bilibili.com/video/av4242055/?spm_id_from=333.788.videocard.1

2020-03-02 16:10:05 Lan Hui(1348141770)  The Code is about how the Linux OS is originated and managed by loosely organized communities.

2020-03-02 16:10:23 Lan Hui(1348141770)  If you never saw it before, it is worth watching.

2020-03-02 16:10:46 Lan Hui(1348141770)  Thus far I've talked about proprietary code, open source code, two reasons for open source (More Publicity and Reap the Benefits), difficulty in letting outside people understand your codebase, and the important management tip DON'T THROW AWAY YOUR CODE.

2020-03-02 16:11:28 Lan Hui(1348141770)  Did you guys have a chance to read in more depth about the DON'T THROW AWAY YOUR CODE advice?

2020-03-02 16:11:51 Lan Hui(1348141770)  The author is Joel Spolsky,

2020-03-02 16:12:01 Marie(2928285277)
Yes

2020-03-02 16:12:02 Lan Hui(1348141770)  Co-founder of Stack Overflow.

2020-03-02 16:12:31 Lan Hui(1348141770)  [图片]

2020-03-02 16:12:45 Lan Hui(1348141770)  (Thanks, Marie.)

2020-03-02 16:13:10 Lan Hui(1348141770)  Wow, Joel is good at writing convincing blogs.

2020-03-02 16:13:27 Lan Hui(1348141770)  Every Chinese professor should read his 1,000+ blog posts.

2020-03-02 16:13:51 Lan Hui(1348141770)  Could you see the picture?

2020-03-02 16:14:16 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
yes I do see the picture 

2020-03-02 16:14:23 Nicole Rutagengwa (1403962700)
yeah

2020-03-02 16:14:30 Kumson爸爸(3157209053)
yes

2020-03-02 16:14:40 NGOUNOU家长(438499151)
yeah

2020-03-02 16:14:57 Guedalia Youma (3014432207)
Yes 

2020-03-02 16:15:04 Lan Hui(1348141770)  His points in this blog are really insightful.

2020-03-02 16:15:13 Lan Hui(1348141770)  I never thought about those before:

2020-03-02 16:15:29 Lan Hui(1348141770)  We have spent a tremendous amount of time on the Old Code.

2020-03-02 16:15:46 Lan Hui(1348141770)  More importantly, the Old Code has been used and tested, while New Code has not.

2020-03-02 16:16:06 Lan Hui(1348141770)  This difference is really important.

2020-03-02 16:16:58 Lan Hui(1348141770)  Any comments on the browser war between Microsoft and Netscape Communications?

2020-03-02 16:17:38 Lan Hui(1348141770)  Perhaps Netscape Communications was doomed to fail because his competitor was way too strong.

2020-03-02 16:18:22 Lan Hui(1348141770)  I believe even the Netscape team had not thrown away their old code, their chance to win was quite slim.

2020-03-02 16:19:16 Lan Hui(1348141770)  Windows was a dominant desktop OS and IE was bundled (not for sale) with it.

2020-03-02 16:19:58 Lan Hui(1348141770)  Average users won't download another web browser unless IE is too bad, which is of course not the case.

2020-03-02 16:20:41 Lan Hui(1348141770)  Very few companies in the world has the ability to develop and maintain OS.

2020-03-02 16:21:26 Lan Hui(1348141770)  IBM, Microsoft, Canonical, Redhat, etc.  Very hard to name other companies.

2020-03-02 16:21:47 Lan Hui(1348141770)  Ubuntu is not a company just as Windows is not a company.

2020-03-02 16:21:59 Lan Hui(1348141770)  Apple is also able to develop and maintain OSes.

2020-03-02 16:22:19 Lan Hui(1348141770)  Google's android is based on Linux.

2020-03-02 16:22:32 Lan Hui(1348141770)  Today's web browser market share ...

2020-03-02 16:22:42 Lan Hui(1348141770)  [图片]

2020-03-02 16:23:02 Lan Hui(1348141770)  Chrome has taken over IE.

2020-03-02 16:23:25 Lan Hui(1348141770)  IE was dead around five years ago.  Now Microsoft bundles Edge with Windows 10.

2020-03-02 16:23:32 Lan Hui(1348141770)  Let's take a 5-minute break.

2020-03-02 16:24:31 Guedalia Youma (3014432207)
Okay Sir 

2020-03-02 16:25:16 Nicole Rutagengwa (1403962700)
 alright

2020-03-02 16:30:17 Lan Hui(1348141770)  =======================================================================

2020-03-02 16:30:40 Lan Hui(1348141770)  [图片]

2020-03-02 16:30:59 Lan Hui(1348141770)  [图片]

2020-03-02 16:31:12 Lan Hui(1348141770)  I won't go through their history year by year.

2020-03-02 16:31:37 Lan Hui(1348141770)  One point I want to make is that Microsoft actually negotiated with Netscape when Netscape was Really hot (in 1994).

2020-03-02 16:32:05 Lan Hui(1348141770)  Microsoft is good at marketing strategy: If I could not beat you, we become friends.

2020-03-02 16:32:27 Lan Hui(1348141770)  Now it has already started embracing open source.

2020-03-02 16:32:36 Lan Hui(1348141770)  A very adaptive and flexible company.

2020-03-02 16:32:59 Lan Hui(1348141770)  Joel Spolsky worked for Microsoft for a period of time.

2020-03-02 16:33:14 Lan Hui(1348141770)  I guess Microsoft will last at least 10 more years.

2020-03-02 16:33:37 Lan Hui(1348141770)  Strangely, Microsoft does not do very well in the mobile market.

2020-03-02 16:33:48 Lan Hui(1348141770)  Windows Phone is not a success.

2020-03-02 16:34:32 Lan Hui(1348141770)  Competition is good in a healthy society.

2020-03-02 16:34:41 Lan Hui(1348141770)  It promotes innovation.

2020-03-02 16:35:23 Lan Hui(1348141770)  [图片]

2020-03-02 16:35:35 Lan Hui(1348141770)  Here we have the contrived word "coopetition".

2020-03-02 16:35:45 Lan Hui(1348141770)  What does that word mean?

2020-03-02 16:36:17 Lan Hui(1348141770)  Compete and Collaborate.

2020-03-02 16:36:46 Lan Hui(1348141770)  I take the Big part of the interest, you take the small parts.

2020-03-02 16:36:58 Lan Hui(1348141770)  In fact, Netscape Communications did quite well on that.

2020-03-02 16:37:24 Lan Hui(1348141770)  It published standards, and attracted partners (e.g., GE, Sun, and Informix).

2020-03-02 16:38:00 Lan Hui(1348141770)  Like Apple, it needs thousands of developers to develop Apple Apps that run on the MacOS.

2020-03-02 16:39:02 Lan Hui(1348141770)  [图片]

2020-03-02 16:39:09 Lan Hui(1348141770)  Two persons with the last names ended with 'ski(y)'.

2020-03-02 16:39:32 Lan Hui(1348141770)  Zawin-ski and Spol-sky

2020-03-02 16:40:09 Lan Hui(1348141770)  “Netscape was shipping garbage, and shipping it late.” 

2020-03-02 16:40:41 Lan Hui(1348141770)  This talks about the time when the Netscape team tried in vain to write everything from scratch.

2020-03-02 16:41:04 Lan Hui(1348141770)  Do not underestimate the amount of work that requires.

2020-03-02 16:41:34 Lan Hui(1348141770)  In fact, Netscape 5.0 was delayed and never released.

2020-03-02 16:42:49 Lan Hui(1348141770)  Developing Groupware also sucked up their energy badly.

2020-03-02 16:43:23 Lan Hui(1348141770)  Short Time + Big Ambition = Failure

2020-03-02 16:44:22 Lan Hui(1348141770)  A Baby Step Each Day * 360 Days  = Success.

2020-03-02 16:45:10 Lan Hui(1348141770)  "Open source does work, but it is most definitely not a panacea. If there's a cautionary tale here, it is that you can't take a dying project, sprinkle it with the magic pixie dust of *open source*, and have everything magically work out. Software is hard. The issues aren't that simple."

2020-03-02 16:45:33 Lan Hui(1348141770)  The above sentence appears in our textbook (Chapter 1).

2020-03-02 16:45:45 Lan Hui(1348141770)  There is no such a thing that can cure everything.

2020-03-02 16:45:53 Lan Hui(1348141770)  Open source is not an exception.

2020-03-02 16:47:15 Lan Hui(1348141770)  For the Netscape team, I do not think open source is an option in their original plan.  

2020-03-02 16:47:41 Lan Hui(1348141770)  Instead, open source is likely their last resort.

2020-03-02 16:48:30 Lan Hui(1348141770)  If you look at the present market share, Firefox, although still in the 3rd place, has only less than 5% of the market.

2020-03-02 16:48:48 Lan Hui(1348141770)  BTW, Firefox evolved from Netscape.

2020-03-02 16:48:57 Lan Hui(1348141770)  Let's take a break.

2020-03-02 16:50:29 莫莫(3481157233)
Okey 

2020-03-02 16:50:43 NGOUNOU家长(438499151)
Ok

2020-03-02 16:56:37 Lan Hui(1348141770)  =========================================

2020-03-02 16:57:19 Lan Hui(1348141770)  It seems that we should really establish corporations (companies) to take over market share.

2020-03-02 16:57:38 Lan Hui(1348141770)  A charity organization is unable to compete with companies.

2020-03-02 16:58:41 Lan Hui(1348141770)  Maybe in the long term, the charity organization may have an upper hand?

2020-03-02 16:58:44 Lan Hui(1348141770)  Who knows?

2020-03-02 16:59:36 Lan Hui(1348141770)  [图片]

2020-03-02 16:59:53 Lan Hui(1348141770)  OK. Since Netscape has failed, we can blame it unscrupulously.

2020-03-02 17:00:11 Lan Hui(1348141770)  You shouldn't have done this, and shouldn't have done that.  Say things like that.

2020-03-02 17:00:31 Lan Hui(1348141770)  Perhaps Microsoft was making these mistakes too,

2020-03-02 17:00:41 Lan Hui(1348141770)  but probably in a lesser degree.

2020-03-02 17:01:15 Lan Hui(1348141770)  Hopefully we won't repeat that.

2020-03-02 17:01:38 Lan Hui(1348141770)  Be aware of Feature Creep or Request Creep.

2020-03-02 17:02:08 Lan Hui(1348141770)  Something becomes creep if it exceeds the current team's capacity.

2020-03-02 17:02:26 Lan Hui(1348141770)  You might have a great idea.  But to realize that idea requires great craftsmanship (Steve Jobs).

2020-03-02 17:02:51 Lan Hui(1348141770)  And don't forget you have competitors who are doing their best to eat our market share.

2020-03-02 17:03:40 Lan Hui(1348141770)  If we don't keep a rhythm of releases, chances are that customers may forget us.

2020-03-02 17:04:10 Lan Hui(1348141770)  In the commercial world, you must release your product often and robust.

2020-03-02 17:05:01 Lan Hui(1348141770)  To that end, refactor your code to make your codebase reasonably clean.  (Remember the cumulative functionality vs. time curve from Martin Fowler, https://martinfowler.com/articles/is-quality-worth-cost.html ?)

2020-03-02 17:06:58 Lan Hui(1348141770)  [图片]

2020-03-02 17:07:40 Lan Hui(1348141770)  The point of setting release expectation is to reassure people and supply comfort.

2020-03-02 17:07:58 Lan Hui(1348141770)  Will you use a product that is no longer supported?

2020-03-02 17:08:26 Lan Hui(1348141770)  The really crucial thing in software industry is support and maintenance.

2020-03-02 17:08:57 Lan Hui(1348141770)  If support and maintenance are discontinued, the life of the software has ended.

2020-03-02 17:09:16 Lan Hui(1348141770)  ======================================================

2020-03-02 17:09:27 Lan Hui(1348141770)  That's everything for today.

2020-03-02 17:09:39 Lan Hui(1348141770)  Please write your student number below.  Thanks.  Bye.

2020-03-02 17:10:09 Nicole Rutagengwa (1403962700)
201925800169

2020-03-02 17:10:41 NGOUNOU家长(438499151)
201925800180

2020-03-02 17:10:41 Kumson爸爸(3157209053)
201925800166

2020-03-02 17:11:15 Guedalia Youma (3014432207)
201925800221

2020-03-02 17:12:51 莫莫(3481157233)
201925800178

2020-03-02 17:14:41 系统消息(10000)
Twizere Pacifique 唐平撤回了一条消息

2020-03-02 17:14:52 Twizere Pacifique 唐平<pacitwizere@hotmail.com>
201925800174

2020-03-02 17:19:48 Marie(2928285277)
201925800173



Friday, 6 March 2020
====================

*LRR now has maintainers - Pricing plan - How to keep software alive - Why pay and pay for what - Why report bugs - License - Proprietary software - Quiz*

2020-03-06 7:26:15 初阳软工171 伍泰炜(2728735169) 201736900125

2020-03-06 8:00:09 初阳软工171 徐闰钞(374526027) 201736900127

2020-03-06 8:00:17 蓝珲(1348141770) 伍泰炜这么早点名？

2020-03-06 8:00:24 初阳软工171 余慧(945168786) 201736900117

2020-03-06 8:00:26 软工初阳171 刘莉莉(1196448461) 201736900108

2020-03-06 8:00:35 网络171许晓鹏(892376699) 201730210128

2020-03-06 8:00:36 重新做人(1344914885) 201736900113

2020-03-06 8:00:37 软工初阳171周佳威<zhouwys@qq.com> 201736900130

2020-03-06 8:00:38 初阳软工171方梓安(2453122992) 201736900105

2020-03-06 8:00:38 网络171-侯新苗(953957823) 201730210304

2020-03-06 8:00:38 软工初阳171 何可人(1461938594) 201736900106

2020-03-06 8:00:41 初阳软工171 伍泰炜(2728735169) [图片]

2020-03-06 8:00:43 唐叶尔(1768559501) 201736900111

2020-03-06 8:00:51 软件工程初阳1701 徐梦旗(2663479778) 201732120124

2020-03-06 8:00:56 初阳软工171袁世家(1515245651) 201739230123

2020-03-06 8:00:59 软件工程  常思琦(995959606) 201732120101

2020-03-06 8:01:00 初阳软工171 王海榕(1012635788) 201732120105

2020-03-06 8:01:02 软件工程 王雪洁(249795581) 201732120106

2020-03-06 8:01:07 初阳软工171 吴贞娴(1395588359) 201732120108

2020-03-06 8:01:16 软件工程 张珣(1955357976) 201732120109

2020-03-06 8:01:46 初阳软工171 伍泰炜(2728735169) 201736900125

2020-03-06 8:01:50 蓝珲(1348141770) 大家有没有收到返校通知？

2020-03-06 8:01:56 网络171—董文文(2373706002) 201730210303

2020-03-06 8:01:56 蓝珲(1348141770) 没有吧？

2020-03-06 8:01:58 网络171许晓鹏(892376699) 没有

2020-03-06 8:02:00 初阳软工171 伍泰炜(2728735169) 没有

2020-03-06 8:02:03 软件工程 张珣(1955357976) 没有

2020-03-06 8:02:05 软工初阳171 何可人(1461938594) 没有

2020-03-06 8:02:07 软件工程初阳1701 徐梦旗(2663479778) 没有

2020-03-06 8:02:13 蓝珲(1348141770) 谢谢。

2020-03-06 8:02:32 蓝珲(1348141770) 今天我们最后5分钟做一个课堂Quiz。

2020-03-06 8:02:39 蓝珲(1348141770) 突袭。

2020-03-06 8:03:11 蓝珲(1348141770) 我们上次讲到，

2020-03-06 8:03:23 蓝珲(1348141770) Feature Creep， Request Creep的危害。

2020-03-06 8:03:34 蓝珲(1348141770) 就是会把团队拖死， 

2020-03-06 8:04:02 蓝珲(1348141770) 让团队忙死，疲于奔命，而无法交付健壮产品。

2020-03-06 8:04:20 蓝珲(1348141770) 还有一个就是“不要扔掉老代码”。https://www.joelonsoftware.com/2000/04/06/things-you-should-never-do-part-i/

2020-03-06 8:04:33 蓝珲(1348141770) 主要原因是什么？

2020-03-06 8:04:47 蓝珲(1348141770) （1）老代码受过“考验”。

2020-03-06 8:04:59 蓝珲(1348141770) （2）新代码没有受过“考验”。

2020-03-06 8:05:28 蓝珲(1348141770) 一个新闻，

2020-03-06 8:05:44 蓝珲(1348141770) 我们的LRR已经有人维护了，ASHLY。

2020-03-06 8:06:08 蓝珲(1348141770) 他解决了一个注册后不能登录的问题。

2020-03-06 8:06:28 蓝珲(1348141770) 很傻的问题，长期得不到解决，直到出现了ASHLY。

2020-03-06 8:07:10 蓝珲(1348141770) 上次课我给了大家两个链接，也不知道你们看过没有。

2020-03-06 8:07:24 蓝珲(1348141770) https://martinfowler.com/articles/is-quality-worth-cost.html

2020-03-06 8:07:39 蓝珲(1348141770) https://www.joelonsoftware.com/2000/04/06/things-you-should-never-do-part-i/

2020-03-06 8:08:15 蓝珲(1348141770) 我最近在看joelsoftware这个网站的东西。Joel是Stack Overflow的创始人兼前CEO。

2020-03-06 8:08:42 蓝珲(1348141770) [图片]

2020-03-06 8:09:30 蓝珲(1348141770) Joel Spolsky在10来年间写了1000多篇东西。

2020-03-06 8:09:51 蓝珲(1348141770) 我觉得每个教软件工程或者软件项目管理的老师都应该看看。

2020-03-06 8:09:57 蓝珲(1348141770) 吸收其精华。

2020-03-06 8:10:26 蓝珲(1348141770) 你们的Quiz1我已经改好了。对分易可以查看。

2020-03-06 8:10:33 蓝珲(1348141770) Quiz2我还没有看。

2020-03-06 8:10:44 蓝珲(1348141770) Quiz2是关于Netscape怎么覆灭记的。

2020-03-06 8:11:18 蓝珲(1348141770) 除了其他的原因，主要是对手微软不是猪，太强了。

2020-03-06 8:11:58 蓝珲(1348141770) 微软在个人电脑市场，在90年代占90%份额以上。

2020-03-06 8:12:03 蓝珲(1348141770) 在中国几乎是100%。

2020-03-06 8:12:38 蓝珲(1348141770) 现在的话MacOS会有一点份额。

2020-03-06 8:13:19 蓝珲(1348141770) 我们还稍微讲了下开源，闭源的问题。

2020-03-06 8:13:32 蓝珲(1348141770) 开源 - open source。

2020-03-06 8:13:40 蓝珲(1348141770) 闭源 - closed-source。

2020-03-06 8:13:47 蓝珲(1348141770) 开源不等于免费。

2020-03-06 8:13:53 蓝珲(1348141770) 闭源不等于收费。

2020-03-06 8:14:00 蓝珲(1348141770) 这个大家都知道的吧？

2020-03-06 8:14:25 蓝珲(1348141770) 开源，就是把源码暴露给大家。

2020-03-06 8:14:35 蓝珲(1348141770) 那么怎么个收费法？

2020-03-06 8:15:01 蓝珲(1348141770) 收取服务费，或者按照Pricing Plan计费。

2020-03-06 8:15:50 蓝珲(1348141770) 对于绝大多数用户，把源码给他看和不看完全没有区别，反正都看不懂，更不用说去修改了。

2020-03-06 8:16:27 蓝珲(1348141770) 收取服务费，培训费，咨询费的有Canonical公司的产品Ubuntu.

2020-03-06 8:17:34 蓝珲(1348141770) 按Plan计费的有RStudio。

2020-03-06 8:19:08 蓝珲(1348141770) 听说Canonical公司现在还是在亏本，不知道是怎么运营的。

2020-03-06 8:19:29 蓝珲(1348141770) 最左边的，企业级安全与审计。

2020-03-06 8:19:36 蓝珲(1348141770) 给企业提供服务。 https://ubuntu.com/pricing

2020-03-06 8:20:03 蓝珲(1348141770) 个人的钱它就不去赚了。给企业服务，赚取大钱。

2020-03-06 8:20:22 蓝珲(1348141770) Ubuntu近些年牌子还是打出去了。

2020-03-06 8:20:51 蓝珲(1348141770) 在北美大学，服务器基本上都跑Ubuntu Server了吧。

2020-03-06 8:21:22 蓝珲(1348141770) 还有一个就是24/7的售后服务团队。

2020-03-06 8:22:02 蓝珲(1348141770) 奇了怪了，浙师大怎么不装Ubuntu？

2020-03-06 8:22:15 蓝珲(1348141770) Ubuntu有一个中国版。

2020-03-06 8:22:52 初阳软工171 伍泰炜(2728735169) 有的机房有的

2020-03-06 8:22:54 蓝珲(1348141770) 叫做优麒麟。

2020-03-06 8:22:56 蓝珲(1348141770) http://www.ubuntukylin.com/

2020-03-06 8:23:13 蓝珲(1348141770) [图片]

2020-03-06 8:23:23 蓝珲(1348141770) 中国方面，应该是要付钱给Canonical的。

2020-03-06 8:23:54 蓝珲(1348141770) 休息5分钟。

2020-03-06 8:23:57 蓝珲(1348141770) =======================================================

2020-03-06 8:25:03 软工初阳171 应舸(1434305984) sorry ，i forget to sign i01736900128

2020-03-06 8:25:59 初阳软工171叶红霞(1655602611) 抱歉，我也没签201736900115

2020-03-06 8:26:22 初阳软工171 蒋佳玲(1850424414) 抱歉，我也没有 201732120103

2020-03-06 8:28:12 计非181 王智洋(1162466610) 抱歉，我也没有 201830220719

2020-03-06 8:29:47 初阳软工171 陈肖飞(1662727361) 201736900104

2020-03-06 8:29:51 蓝珲(1348141770) 签了就可以

2020-03-06 8:30:31 蓝珲(1348141770) Ubuntu这些开源的操作系统很难火起来，一个主要的原因

2020-03-06 8:30:44 蓝珲(1348141770) 是它不是默认与硬件整机绑定的.

2020-03-06 8:30:54 蓝珲(1348141770) 绑定是个杀手锏。

2020-03-06 8:31:09 蓝珲(1348141770) 大家一般买个电脑，都预装了系统了。

2020-03-06 8:31:40 蓝珲(1348141770) "The most comprehensive Linux enterprise subscription”

2020-03-06 8:31:50 蓝珲(1348141770) Subscription是什么意思？

2020-03-06 8:32:05 蓝珲(1348141770) 订阅？

2020-03-06 8:32:10 初阳软工171 伍泰炜(2728735169) 市场占有率

2020-03-06 8:32:27 初阳软工171 伍泰炜(2728735169) 类似意思吧

2020-03-06 8:32:47 蓝珲(1348141770) [图片]

2020-03-06 8:33:03 蓝珲(1348141770) 是订阅嘛。

2020-03-06 8:33:19 蓝珲(1348141770) 好像订报纸似的，

2020-03-06 8:33:27 蓝珲(1348141770) 每年要交钱。

2020-03-06 8:33:43 蓝珲(1348141770) 所以，Ubuntu收的是这部分的钱。

2020-03-06 8:33:58 蓝珲(1348141770) 企业级的“订阅”费。

2020-03-06 8:34:30 蓝珲(1348141770) 意思就是说，我们签一个协议，你企业的服务器我来给你运维，然后你一年给我10-100万不等。

2020-03-06 8:34:37 蓝珲(1348141770) 大概就是这个意思。

2020-03-06 8:34:53 蓝珲(1348141770) 对于大企业来说，100万毛毛雨了。

2020-03-06 8:35:32 蓝珲(1348141770) 对于技术企业，估计也可以请专人做。

2020-03-06 8:35:55 蓝珲(1348141770) 如雇佣2-5个人运维，但是也要付工资的不是？

2020-03-06 8:36:35 蓝珲(1348141770) 所以，开源产品，服务、运维这一块，应该是很重要的一个收入。

2020-03-06 8:36:53 蓝珲(1348141770) 大家知道，不被运维的软件注定是死的软件。

2020-03-06 8:37:14 蓝珲(1348141770) 软件的活力在于持续改善，持续更新。

2020-03-06 8:37:37 蓝珲(1348141770) （看来你们的英文比较菜啊。）

2020-03-06 8:37:52 蓝珲(1348141770) （多看看英文网站，就能提高。）

2020-03-06 8:39:00 蓝珲(1348141770) 你们看看Ubuntu的团队。

2020-03-06 8:39:18 蓝珲(1348141770) （对了，Ubuntu是建立在Debian开源操作系统上的。)

2020-03-06 8:39:56 蓝珲(1348141770) https://wiki.ubuntu.com/Teams

.. image:: ubuntu-team.jpg
   :height: 100
   :alt:  Ubuntu team https://wiki.ubuntu.com/Teams

2020-03-06 8:40:34 蓝珲(1348141770) 内核团队，就是维护底层操作系统的。

2020-03-06 8:40:52 蓝珲(1348141770) 基础团队。

2020-03-06 8:41:12 蓝珲(1348141770) 在一些中国公司是有基础部的，搞不清楚是做什么的。

2020-03-06 8:42:24 蓝珲(1348141770) 它的Communication Tools那列

2020-03-06 8:42:25 蓝珲(1348141770) #ubuntu-devel

2020-03-06 8:42:35 蓝珲(1348141770) hashtag ubuntun-devel

2020-03-06 8:42:49 蓝珲(1348141770) 是基础团队的IRC聊天室。

2020-03-06 8:43:08 蓝珲(1348141770) devel是指开发，可能是应用软件的开发。

2020-03-06 8:43:28 蓝珲(1348141770) QA团队，就是质量保障团队了。

2020-03-06 8:43:56 蓝珲(1348141770) 看到没有，每个团队都有一个聊天室。

2020-03-06 8:44:12 蓝珲(1348141770) 看来，在英国，大家还是用IRC比较多。

2020-03-06 8:44:49 蓝珲(1348141770) 其中一个原因就是Ubuntu团队成员分散在世界各地。

2020-03-06 8:45:11 蓝珲(1348141770) 还有，IRC比较轻量？

2020-03-06 8:46:03 蓝珲(1348141770) 上图列出的是Ubuntu Engineering Teams

2020-03-06 8:46:23 蓝珲(1348141770) 是工程部门的，我估计公司还有销售部门、宣传部门。

2020-03-06 8:46:41 蓝珲(1348141770) 我们看看最后一列，开会。

2020-03-06 8:46:58 蓝珲(1348141770) 好像大多是每周开一次会。

2020-03-06 8:47:05 蓝珲(1348141770) 开会也在IRC上开的吧？

2020-03-06 8:47:29 蓝珲(1348141770) 这个是Ubuntu的情况。

2020-03-06 8:47:34 蓝珲(1348141770) 我们看看RStudio.

2020-03-06 8:48:10 蓝珲(1348141770) 这款软件我也用得比较多的。用来做数据分析，像MATLAB。

2020-03-06 8:49:16 蓝珲(1348141770) https://rstudio.com/

2020-03-06 8:49:33 蓝珲(1348141770) 你们把鼠标放在Products下面，看到没有，它也是Open Source的。

2020-03-06 8:49:58 蓝珲(1348141770) 也有不同的收费栏目。https://rstudio.com/pricing/

2020-03-06 8:50:03 蓝珲(1348141770) 休息5分钟。

2020-03-06 9:00:38 蓝珲(1348141770) ======================================================

2020-03-06 9:01:01 蓝珲(1348141770) 如果需要人工支持，那么桌面版就是995美元每年。

2020-03-06 9:01:18 蓝珲(1348141770) 这个针对个人用户，自由职业者？

2020-03-06 9:01:49 蓝珲(1348141770) 如果是Server Pro，那么就是4975美元每年。

2020-03-06 9:02:06 蓝珲(1348141770) 限于5个用户。

2020-03-06 9:02:23 蓝珲(1348141770) 什么样的人会去买这个呢？

2020-03-06 9:02:31 蓝珲(1348141770) 银行会买。

2020-03-06 9:02:47 蓝珲(1348141770) 审计企业会买。比如普华永道之类的。

2020-03-06 9:03:25 蓝珲(1348141770) 因为这个工具RStudio对于这些企业的作用远远大于所花的金钱。

2020-03-06 9:03:58 蓝珲(1348141770) 在成熟的软件工业社会，用户是乐于付费的。

2020-03-06 9:04:11 蓝珲(1348141770) 因为用户知道，只有付费，才能有更好的服务。

2020-03-06 9:04:20 蓝珲(1348141770) 这个不是必然的道理吗？

2020-03-06 9:04:40 蓝珲(1348141770) 付费，给开发者发好的工资，开发更好的产品。

2020-03-06 9:05:12 蓝珲(1348141770) 用户还是乐于报告软件运行错误的，目的就是帮助改进软件。

2020-03-06 9:05:29 蓝珲(1348141770) 像我们，发现奔溃了，赶紧关掉。

2020-03-06 9:06:25 蓝珲(1348141770) 软件，稍微像样一点的那种，

2020-03-06 9:06:34 蓝珲(1348141770) 会跟一个许可证（License）。

2020-03-06 9:06:53 蓝珲(1348141770) 许可证就是规定了你能拿这个软件做什么。

2020-03-06 9:07:03 蓝珲(1348141770) 有各种各样的许可证了。

2020-03-06 9:07:21 蓝珲(1348141770) 开源的许可证种类就至少有10种之多吧？

2020-03-06 9:07:59 蓝珲(1348141770) https://opensource.org/licenses

2020-03-06 9:08:06 蓝珲(1348141770) Popular Licenses the following OSI-approved licenses are popular, widely used, or have strong communities: Apache License 2.0 BSD 3-Clause "New" or "Revised" license BSD 2-Clause "Simplified" or "FreeBSD" license GNU General Public License (GPL) GNU Library or "Lesser" General Public License (LGPL)MIT license Mozilla Public License 2.0 Common Development and Distribution License Eclipse Public License version 2.0

2020-03-06 9:08:27 蓝珲(1348141770) 阿帕奇(Apache)，GPL， MIT用的人比较多。

2020-03-06 9:08:55 蓝珲(1348141770) GPL许可证保证了四大自由。

2020-03-06 9:09:23 蓝珲(1348141770) 而且它的“子孙”（衍生品）也要满足这些自由。

2020-03-06 9:10:16 蓝珲(1348141770) A软件是用GPL的，然后B软件用到A软件的一部分代码，那么B软件一定要用GPL。

2020-03-06 9:10:47 蓝珲(1348141770) 不想？那对不起，你不能用我的A软件。

2020-03-06 9:10:54 蓝珲(1348141770) 硬要用？

2020-03-06 9:11:18 蓝珲(1348141770) 自己用用，我管不了那么多。拿去卖？那就不行。

2020-03-06 9:11:51 蓝珲(1348141770) 许可证许可证，就是你要用我的东西，只能按照我许可的条款去做。

2020-03-06 9:12:02 蓝珲(1348141770) 有点霸道，但是受法律保护。

2020-03-06 9:12:44 蓝珲(1348141770) 大家有空可以研究一下Apache、MIT、GPL这些许可证。

2020-03-06 9:13:22 蓝珲(1348141770) 你的软件包括了私有软件而且还卖的很好? 这可不是好事, 小心私有软件的作者(公司)告你侵权。

2020-03-06 9:13:40 蓝珲(1348141770) 私有软件当然也有许可证。

2020-03-06 9:14:02 蓝珲(1348141770) 这个许可证，称为“不许可证”也许更为恰当。

2020-03-06 9:14:07 蓝珲(1348141770) 限制特别多。

2020-03-06 9:14:24 蓝珲(1348141770) 比如，只能你自己使用之类的。

2020-03-06 9:14:42 蓝珲(1348141770) 你们用的一些软件产品，比如OneNote之类的，也是有许可证的。

2020-03-06 9:14:55 蓝珲(1348141770) 越成功，越要注意这个软件许可证问题。否则，很麻烦。

2020-03-06 9:15:23 蓝珲(1348141770) 阿里巴巴公司不是要去IOE吗，就是舍不得支付软件许可证费，就是在这方面感觉被束缚手脚了。

2020-03-06 9:15:43 蓝珲(1348141770) IOE，I指IBM，O指Oracle，E指什么？

2020-03-06 9:16:24 蓝珲(1348141770) 前段时间有个新闻，说阿里的Oceanbase “超过” Oracle了。

2020-03-06 9:16:29 蓝珲(1348141770) 大家可以研究一下。

2020-03-06 9:16:36 蓝珲(1348141770) https://www.infoq.cn/article/JKHPqdcSgStDbG2DF0xb?utm_source=weibo&utm_medium=infoq&utm_campaign=newinfoq&utm_content=1005

2020-03-06 9:16:43 蓝珲(1348141770) http://www.tpc.org/tpcc/results/tpcc_result_detail.asp?id=119100101   https://www.zhihu.com/question/30209216

2020-03-06 9:17:06 软工初阳171 应舸(1434305984) EMC存储设备

2020-03-06 9:17:08 蓝珲(1348141770) 我们休息一下，就准备Quiz了。

2020-03-06 9:18:29 蓝珲(1348141770) 对了，你们接下去要读第二章。

2020-03-06 9:18:54 蓝珲(1348141770) 做个计划，每天读一点，做点笔记。

2020-03-06 9:19:08 蓝珲(1348141770) 不要到时候全部再看一遍，慌里慌张。

2020-03-06 9:19:12 计非181 王智洋(1162466610) 老师能发一下电子书吗

2020-03-06 9:19:32 蓝珲(1348141770) https://producingoss.com/

2020-03-06 9:19:45 蓝珲(1348141770) 你去这里下载PDF文件就可以。

2020-03-06 9:19:54 蓝珲(1348141770) 我看看我电脑上有没有。

2020-03-06 9:20:10 计非181 王智洋(1162466610) 谢谢老师

2020-03-06 9:22:11 蓝珲(1348141770) 我们的Quiz在9:40前交。

2020-03-06 9:22:38 蓝珲(1348141770) 是非题，选2个回答就可以。

2020-03-06 9:22:42 蓝珲(1348141770) 独立完成。

2020-03-06 9:22:50 蓝珲(1348141770) 在对分易上交。

2020-03-06 9:23:03 初阳软工171 伍泰炜(2728735169) 在哪个模块提交呢

2020-03-06 9:23:07 蓝珲(1348141770) [图片]

2020-03-06 9:23:15 网络171许晓鹏(892376699) 判断?

2020-03-06 9:23:23 蓝珲(1348141770) Quiz 3.

2020-03-06 9:23:41 蓝珲(1348141770) 判断题。对或错。

2020-03-06 9:26:17 蓝珲(1348141770) 再见。有空记得查看课程主页  http://lanlab.org/course/2020s/spm

2020-03-06 9:26:44 蓝珲(1348141770) 不要忘了交Quiz，今天上午9点40前，还有15分钟。



Monday, 9 March 2020
====================


Morning section
----------------

*Sustained efforts - How to earn 1b 10 years later - Software licenses - Copyleft - Non-copyleft - Commercial - Non-commercial - Proprietary - Non-proprietary - Quiz*


蓝老师(1348141770)  ===================================================

蓝老师(1348141770)  Morning guys.  Could you type your student number?

2020-03-09 10:36:06 ibrahim(1525200991)  201732120159

2020-03-09 10:36:06 201732120167 Clive妈妈(3321692247)  201732120167

2020-03-09 10:36:07 软英171周仙龙(1748153603)  201732120130

2020-03-09 10:36:08 201732120141--AHAMED SABUJ妈妈(2686217157)  201732120141

2020-03-09 10:36:08 201732120168_Golden(2984538488)  201732120168

2020-03-09 10:36:08 201732120127 张滨(2350711965)  201732120127

蓝老师(1348141770)  It is useful for me.

2020-03-09 10:36:11 201732120134_Michelle(3304952232)  201732120134

2020-03-09 10:36:11 201732120165 MJH MOHAMED(2751595398)  201732120165

2020-03-09 10:36:15 软英171高增(1520653544)  201732120117

2020-03-09 10:36:16 李佳兴(421281726)  201732120118

2020-03-09 10:36:16 201632120150-Ashly(1661411131)  201632120150

2020-03-09 10:36:16 软英171 吕伊豪(745291576)  201732120120

2020-03-09 10:36:17 nainezz(2407048879)  201732120173

2020-03-09 10:36:17 叶涵涛(2289316051)  201732120125

2020-03-09 10:36:24 201732120170-Tamene Robel妈妈(3287975278)  201732120170

2020-03-09 10:36:29 Saeed : 201732120146(446571011)  201732120146

2020-03-09 10:36:49 201732120157 hossain arif<charif19282@qq.com>  201732120157

蓝老师(1348141770)  Let's wait 4 minutes for more people to join in.

2020-03-09 10:37:06 Saeed : 201732120146(446571011)  ok

2020-03-09 10:37:12 软英171包振丰(984456043)  201732120111

2020-03-09 10:37:19 应宇腾(1356633192)  20732120126

2020-03-09 10:37:24 软英171陈伟超(937202326)  201732120113

2020-03-09 10:37:33 陈真赐(1312502742)  201732120114

2020-03-09 10:37:58 软英171郑洪宇(1633787262)  201732120128

2020-03-09 10:37:59 系统消息(10000)  201732120165 MJH MOHAMED邀请201732120165_Mohamed_Jifry_Hazzaly加入了本群。

2020-03-09 10:38:14 谢佳聪(1249923715)  201732120123

2020-03-09 10:38:17 郑晓钰(280768265)  201732120110

2020-03-09 10:38:22 软英171 郑可富(1924773187)  201732120129

2020-03-09 10:39:01 ALBOROM WARD-201732120143家长(3279308836)  201732120143

2020-03-09 10:39:11 201732120135 玛莎(3534763826)  201732120135

2020-03-09 10:39:25 软英171 陆博业(2794513466)  201732120119

2020-03-09 10:40:06 蓝老师(1348141770)  [Announcement] We will have a pop-up quiz, near the end of today's lecture.

2020-03-09 10:40:15 Tarmom 201732120166(2104297320)  201732120166

2020-03-09 10:40:35 1n(2835813510)  201732120102

2020-03-09 10:40:36 蓝老师(1348141770)  Make sure you can login LRR.

2020-03-09 10:40:54 Saeed : 201732120146(446571011)  yes

2020-03-09 10:40:58 蓝老师(1348141770)  There is a recent story about LRR.

2020-03-09 10:40:58 软英171戴泽荣(975336710)  201732120115

2020-03-09 10:41:00 Tarmom 201732120166(2104297320)  laoshi I can't

2020-03-09 10:41:10 Saeed : 201732120146(446571011)  try now

2020-03-09 10:41:23 Tarmom 201732120166(2104297320)  ok

2020-03-09 10:41:33 Npl.(593635848)  201732120121

蓝老师(1348141770)  (Tarmom, you should first sign up.)

蓝老师(1348141770)  Ashly updated LRR so that a CRITICAL bug is gone.

蓝老师(1348141770)  I think most of you guys encountered that bug before.

蓝老师(1348141770)  That is, you were unable to sign in immediately after sign up.

2020-03-09 10:42:46 LUL GUOBA RUOT (2217724540)  201632120161

蓝老师(1348141770)  This bug makes the software essentially not usable.

蓝老师(1348141770)  A really bad bug.

蓝老师(1348141770)  You had to recover your password by email (which did not always work).

2020-03-09 10:43:37 Samantha 201632120140(2459455104)  201632120140

蓝老师(1348141770)  It is absurd that we require people to recover their password immediately after they sign up.

蓝老师(1348141770)  Ashly fixed that.

蓝老师(1348141770)  Suddenly the software looks much better.

蓝老师(1348141770)  Where did Ashy learn PHP?

2020-03-09 10:45:27 201632120150-Ashly(1661411131)  Personal projects Laoshi

蓝老师(1348141770)  There are a lot of existing talents.  A manager's job is to recognize them and cultivate them.

蓝老师(1348141770)  That is a Great Fix.

蓝老师(1348141770)  But that fix introduced a new problem.

蓝老师(1348141770)  The old users were no longer able to login, which is almost equally bad.

蓝老师(1348141770)  This is an example of failed regression test.

蓝老师(1348141770)  The new fix breaks old, functional work.

蓝老师(1348141770)  That is quite normal.

蓝老师(1348141770)  The old, legitimate users saw a Blank Page after they logged in, leaving them totally perplexed.

蓝老师(1348141770)  How to solve that?

蓝老师(1348141770)  It turns out the fix is really simple.

蓝老师(1348141770)  [图片]

::

    //  verify the hashed password and unhashed password
    if(password_verify($password, $row["Password"]) or ($password = $row["Password"])){


蓝老师(1348141770)  Just relax the conditional test by adding an OR condition: ($password = $row["Password"]).

蓝老师(1348141770)  The reason is that the old password is not hashed (encrypted).

蓝老师(1348141770)  We must hash people's password by law.

蓝老师(1348141770)  Hash is like a one-way function.

蓝老师(1348141770)  Hash('secrete') gives you a 64 obfuscating characters.

蓝老师(1348141770)  But you cannot recover 'secrete' even if you know these 64 characters.

蓝老师(1348141770)  That is my understanding of one-way.

蓝老师(1348141770)  This small fix solved a Big problem.

蓝老师(1348141770)  That is a great start.

蓝老师(1348141770)  I can even say Ashly is done on the course project.

蓝老师(1348141770)  However, I still hope he could do a bit more.

2020-03-09 10:53:08 Tarmom 201732120166(2104297320)  laoshi still I can't sign up on LRR it's not working.

蓝老师(1348141770)  (Fine.  I will create one for you during the break.)

2020-03-09 10:53:46 Tarmom 201732120166(2104297320)  thank you

蓝老师(1348141770)  Returning to storing password in LRR, can we hash all existing, old passwords so that we can remove the additional OR condition: ($password = $row["Password"])?

蓝老师(1348141770)  Simpler code.

蓝老师(1348141770)  Is it worth doing that?

蓝老师(1348141770)  We have more than 200 accounts now in LRR.

蓝老师(1348141770)  Let us take a 5-minute break.

2020-03-09 10:55:31 Saeed : 201732120146(446571011)       ok

2020-03-09 10:57:17 Tarmom 201732120166(2104297320)  ok

2020-03-09 10:58:46 LUL GUOBA RUOT (2217724540)  Me too I can’t login

蓝老师(1348141770)  ===================================================

蓝老师(1348141770)  That is interesting.  You two guys could sign up again.  I believe it should work now.

蓝老师(1348141770)  What have I learned from this improvement process?

蓝老师(1348141770)  Good software takes time.

蓝老师(1348141770)  Sustained efforts are required to build something that is really great so that people would pay to use it.

蓝老师(1348141770)  You need at least 10 years.

蓝老师(1348141770)  But after 10 years, you will be good, earning billions of dollars a year.

蓝老师(1348141770)  Here is an article I want to share with you.

蓝老师(1348141770)  https://www.joelonsoftware.com/2001/07/21/good-software-takes-ten-years-get-used-to-it/

2020-03-09 11:05:51 Npl.(593635848)  很多人看不到这么远 一年就够呛的

2020-03-09 11:06:18 Npl.(593635848)  [表情]

蓝老师(1348141770)  Yes.  That is true.  That is why we have very few companies which have a yearly revenue of billions.

蓝老师(1348141770)  I doubt LRR could sustain such a long period.

蓝老师(1348141770)  Look at QQ, which started around 1998.

蓝老师(1348141770)  How many years have passed?

蓝老师(1348141770)  More than 20 years!

蓝老师(1348141770)  The current QQ is much better than the original QQ (which is a clone of OICQ).

蓝老师(1348141770)  I would say most people who have not taken this course don't realize that.

蓝老师(1348141770)  Software is hard. And hard things need time. As simple as that.

蓝老师(1348141770)  [图片]

.. image:: lotus-note-user-pool.png
   :height: 100
   :alt:  number of installations of the Lotus Notes over the years

蓝老师(1348141770)  User pool of Lotus Notes.

蓝老师(1348141770)  It hit 55 million users in 1999.

蓝老师(1348141770)  55 million users means lots of money and great influence.

蓝老师(1348141770)  12 years have passed since the author(s) wrote the first line of code.

2020-03-09 11:11:47 ibrahim(1525200991)  most people dream that thier software blow up like Facebook did

蓝老师(1348141770)  The problem of China software industry is exactly Lack of Time.

蓝老师(1348141770)  Desire of Success + Lack of Time = ?

2020-03-09 11:13:06 Npl.(593635848)  failure

蓝老师(1348141770)  [图片]

蓝老师(1348141770)  How much money has Oracle made?

蓝老师(1348141770)  Billions of dollars at least.

2020-03-09 11:14:01 Npl.(593635848)  [图片]

蓝老师(1348141770)  The Oracle database system was there in 1970's.

2020-03-09 11:14:02 Npl.(593635848)  复利曲线

蓝老师(1348141770)  (Oh, really.  That is a good observation.)

蓝老师(1348141770)  This gentleman, Joel Spolsky, the founder of Stack Overflow, is good at writing.

蓝老师(1348141770)  He is a very prolific author.

蓝老师(1348141770)  Produced more than 1000 blog posts over a period of 10 years.

蓝老师(1348141770)  I think you should read his "Top 10" posts.

蓝老师(1348141770)  Let's take a 5-minute break.

2020-03-09 11:17:41 系统消息(10000)  Npl.撤回了一条消息

2020-03-09 11:22:01 Npl.(593635848)  I’ve looked through several his books (his blogs sets, more currently), he thinks most programmers are not true programmer. And it would be good if these “fake programmers” been fired(filter out).[表情]

2020-03-09 11:23:39 ALBOROM WARD-201732120143家长(3279308836)  [表情]

蓝老师(1348141770)  Npl seems like a motivated learner.  We need more self-driven learners.

蓝老师(1348141770)  ===================================================

蓝老师(1348141770)  Writing is Thinking.  Writing is Communicating.

蓝老师(1348141770)  You must sharpen your writing skills before you graduate.

蓝老师(1348141770)  Programming is more like a liberal and arts subject.

蓝老师(1348141770)  Think about that.

2020-03-09 11:26:26 Npl.(593635848)  “Talking” with the computer

蓝老师(1348141770)  If you could earn 1 billion dollars 10 years later by focusing on developing one thing, and leading a very frugal life in these 10 years, would you do that?

蓝老师(1348141770)  I think many people will do that.

蓝老师(1348141770)  That is about 100,000,000 dollars per year.

蓝老师(1348141770)  However, since there is no success guarantee, many people would choose to be a less disciplined person.

蓝老师(1348141770)  We talked about software licenses last time.

蓝老师(1348141770)  One question.

蓝老师(1348141770)  What kind of free license would you use if your software is an online application, i.e., you do not send people installation packages?

蓝老师(1348141770)  Apache, GPL, or MIT?

2020-03-09 11:30:46 ibrahim(1525200991)  MIT

蓝老师(1348141770)  License for online application, things like Simple Note, One Note.

蓝老师(1348141770)  I think MIT is a good one.  It is simple and permissive.

2020-03-09 11:31:25 ibrahim(1525200991)  or AGPL

蓝老师(1348141770)  I want to mention Affero GPL.

蓝老师(1348141770)  Exactly.

蓝老师(1348141770)  Affero GPL has an extra clause designed specifically for online applications.

蓝老师(1348141770)  Are GPL-like licenses MIT-compatible?

蓝老师(1348141770)  Or Are MIT-like licenses GPL-compatible?

蓝老师(1348141770)  GPL is a copyleft license, while MIT is a non-copyleft license.

蓝老师(1348141770)  What does "copyleft" mean?

蓝老师(1348141770)  Copyleft is an interesting word.

2020-03-09 11:33:30 ibrahim(1525200991)  your code can't be used by proprietary software

蓝老师(1348141770)  I don't know that before yesterday.

2020-03-09 11:33:39 ibrahim(1525200991)  I guess

2020-03-09 11:34:05 Dean Majaya201732120164爷爷(3623840484)   201732120164

蓝老师(1348141770)  The exact meaning of copyleft is that all its derivative work under the copyleft license must be copyleft too.

蓝老师(1348141770)  MIT license does not require that.

蓝老师(1348141770)  If you use the code that is under the MIT license, you could apply a proprietary license to your software.

蓝老师(1348141770)  That is why we say MIT license is a permissive license.

蓝老师(1348141770)  The point of copyleft is ensuring that the subsequent (or derivative) work is also free.

蓝老师(1348141770)  However, the danger is that people would rather not use your code in the first place if they think they don't agree with this condition.

蓝老师(1348141770)  A rule of thumb is that if you do not care how your code is to be used, you could use either MIT or GPL or Apache.

蓝老师(1348141770)  If you do not wish proprietary software to use your code, use GPL-like licenses.  They are more restrict on ensuring subsequent freedom.

蓝老师(1348141770)  Note the difference between proprietary and commercial.

蓝老师(1348141770)  They are not the same thing.

蓝老师(1348141770)  A commercial software can be non-proprietary.

蓝老师(1348141770)  A proprietary software can be non-commercial.

蓝老师(1348141770)  Proprietary emphasizes "Owner",

蓝老师(1348141770)  while commercial emphasizes "Money".

蓝老师(1348141770)  [Announcement]

蓝老师(1348141770)  "Decide areas for improvement" is due today.

蓝老师(1348141770)  You need to finish reading Chapter 2 by the end of this week.

蓝老师(1348141770)  Let's take a 5-minute break.

2020-03-09 11:44:36 ALBOROM WARD-201732120143家长(3279308836)  Laoshi how about course scheduler would you let me manage it as my course project?

蓝老师(1348141770)  ===================================================

蓝老师(1348141770)  My main concern is that there are tons of Course Scheduling applications out there.

蓝老师(1348141770)  Your efforts will be wasted on just producing yet-another Course Scheduling application.

蓝老师(1348141770)  Anyway, we could discuss that more after class.

2020-03-09 11:51:24 ALBOROM WARD-201732120143家长(3279308836)  ok laoshi

蓝老师(1348141770)  You need to finish reading Chapter 2 by the end of this week.

蓝老师(1348141770)  I could finish reading one chapter in one evening.

蓝老师(1348141770)  I don't know your reading speed.

2020-03-09 11:52:23 KELVIN Chimtengo(3110702155)  One week is enough.

蓝老师(1348141770)  You can use lots of aids that are available online, such as the Bing translator.

2020-03-09 11:53:01 ALBOROM WARD-201732120143家长(3279308836)  i can finish it in 3-5 hours

2020-03-09 11:53:34 201732120151 Barkay sanoussi(3178573723)  reading  is not a big deal but understanding  is ..

2020-03-09 11:53:57 Saeed : 201732120146(446571011)  yes

蓝老师(1348141770)  To understand it, repeat the reading process.

蓝老师(1348141770)  Repeat it at least three times.

2020-03-09 11:54:26 ibrahim(1525200991)  do you want us to just read it, or understand and highlight some points, if the later then that takes some time

蓝老师(1348141770)  I think the most important purpose of reading is understanding.

2020-03-09 11:55:14 ALBOROM WARD-201732120143家长(3279308836)  yeah that's why i said 3-5 hours including highliting and understanding

蓝老师(1348141770)  Otherwise, Microsoft Edge could read it for us.

2020-03-09 11:55:27 Npl.(593635848)  There is no reading speed, only understanding speed

蓝老师(1348141770)  I will post a new, longer reading: The Cathedral and the Bazaar.

蓝老师(1348141770)  http://catb.org/~esr/writings/cathedral-bazaar/cathedral-bazaar/index.html

蓝老师(1348141770)  It discusses 2 development modes.

蓝老师(1348141770)  You don't have to read all, only a few selected sections.

2020-03-09 11:56:45 ALBOROM WARD-201732120143家长(3279308836)  that would be better

蓝老师(1348141770)  I want to maximize the usefulness of this course while minimizing your workload.

蓝老师(1348141770)  I will post the required sections.

蓝老师(1348141770)  Quiz time.

2020-03-09 11:58:36 ibrahim(1525200991)  wish most teacher follow your theme

蓝老师(1348141770)

::
   
   [True/False] Free software means zero-cost software.
   [True/False] Zero-cost software cannot be proprietary.
   [True/False] If the source code is visible, then the software is open source.
   [True/False] Open source software cannot be used for commercial purposes.

蓝老师(1348141770)  You select two of them to answer.

蓝老师(1348141770)  Submit it at LRR (under Quiz 3).

蓝老师(1348141770)  Before 12:15pm.

蓝老师(1348141770)  Bye.

2020-03-09 11:59:39 ibrahim(1525200991) what if i answer all of them ?

2020-03-09 11:59:46 nainezz(2407048879) Bye

2020-03-09 11:59:53 ABDALMUHAYMEN 201730210234(1071107298) Bye

2020-03-09 11:59:59 Saeed : 201732120146(446571011) ok

蓝老师(1348141770)  Please just answer two questions.

2020-03-09 12:00:18 1n(2835813510) only true or false or explanation also

2020-03-09 12:00:21 KELVIN Chimtengo(3110702155) We should post answers here? Or ?

蓝老师(1348141770)  The two which you feel most confident about.

蓝老师(1348141770)  Just True or False.  No explanation.

2020-03-09 12:00:43 1n(2835813510) ok

2020-03-09 12:00:43 ALBOROM WARD-201732120143家长(3279308836) Submit it at LRR (under Quiz 3).

2020-03-09 12:01:40 KELVIN Chimtengo(3110702155) Okay cool

2020-03-09 12:01:56 KELVIN Chimtengo(3110702155) 201632120149

2020-03-09 12:02:51 201732120170-Tamene Robel妈妈(3287975278) LRR not working



Afternoon Section
-----------------

*Project management tools - Kanboard - Swim lanes - Rhythm of releases - Sustained efforts - Joel Spolsky - Software licenses*

Lan Hui(1348141770)  ===================================================

Lan Hui(1348141770)  Good afternoon.

2020-03-09 15:41:41 Guedalia Youma (3014432207)  Good afternoon professor

Lan Hui(1348141770)  Could you type your student number?  It is useful for me.

2020-03-09 15:41:59 NGOUNOU家长(438499151)  good afternoon laoshi

Lan Hui(1348141770)  I am going to get some hot water.

2020-03-09 15:42:05 Guedalia Youma (3014432207)  201925800221

Lan Hui(1348141770)  Let's wait a few minutes for more people to join in.

2020-03-09 15:42:26 NGOUNOU家长(438499151)  201925800180

2020-03-09 15:42:36 Marie(2928285277)  201925800173

2020-03-09 15:42:36 NGOUNOU家长(438499151)  OK

Lan Hui(1348141770)  Where were we last time?

Lan Hui(1348141770)  I've talked about an important management tip: Don't THROW AWAY YOUR CODE.

Lan Hui(1348141770)  This tip was given by Joel Spolsky, founder of Stack Overflow.

Lan Hui(1348141770)  Also Trello, a $425m product for project management.

2020-03-09 15:45:29 Kumson爸爸(3157209053)  201925800166

Lan Hui(1348141770)  I was thinking about using Trello.

Lan Hui(1348141770)  There are many project management tools out there.

Lan Hui(1348141770)  Trello, JIRA, Microsoft Project, etc.

Lan Hui(1348141770)  I should choose a simpler one.

Lan Hui(1348141770)  So I choose Kanboard.

Lan Hui(1348141770)  https://kanboard.org/

Lan Hui(1348141770)  Have you checked that?

Lan Hui(1348141770)  I can show you in a moment.

Lan Hui(1348141770)  [图片]

.. image:: TIM20200316180248.png
   :height: 100
   :alt: Kanboard for undergraduate thesis supervision

Lan Hui(1348141770)  You can see many cards, in different colors and in different swim lanes.

Lan Hui(1348141770)  We've got 4 swim lanes, representing different project stages.

Lan Hui(1348141770)  The leftmost is **TODO**.

Lan Hui(1348141770)  Followed by **Ready**.

Lan Hui(1348141770)  Followed by **In Progress**.

Lan Hui(1348141770)  Followed by **Done**.

Lan Hui(1348141770)  To avoid multi-tasking, we should minimize the number of cards (tasks) in the **In Progress** swim lane,

Lan Hui(1348141770)  which seems to be not the case in my Kanboard.

Lan Hui(1348141770)  That is why I feel exhausted.

2020-03-09 15:51:19 Nicole Rutagengwa (1403962700)  201935800169

Lan Hui(1348141770)  We can move the cards (tasks) around.

Lan Hui(1348141770)  I plan to ask you to use Kanboard (in our course).

Lan Hui(1348141770)  I will create accounts for you within one week.

Lan Hui(1348141770)  I've also talked about rhythm of releases and the importance of having and keeping that rhythm.

Lan Hui(1348141770)  In the beginning, we should release early and often.

Lan Hui(1348141770)  But when our product becomes more mature, releasing too often is a bit annoying to users (once in a half year is good enough).

Lan Hui(1348141770)  Sometimes people just do not need that many new features if the product has already satisfied their daily use.

Lan Hui(1348141770)  [Announcement] We will have a pop-up quiz, near the end of today's lecture.

Lan Hui(1348141770)  Make sure you can login LRR (Lab Report Repository).

Lan Hui(1348141770)  There is a recent update for LRR.

Lan Hui(1348141770)  Last lecture I mentioned a CRITICAL (even BLOCKER) bug in LRR.

Lan Hui(1348141770)  A new user could not login immediately after sign up.

Lan Hui(1348141770)  That bug was fixed by Ashly, an undergraduate student in the morning section.

Lan Hui(1348141770)  Suddenly, the software looks much better.

2020-03-09 16:00:21 Marie(2928285277)  So do we need to sign up again

Lan Hui(1348141770)  You don't have to recover your password by email, which does not always work, and is quite absurd.

Lan Hui(1348141770) (No.)

Lan Hui(1348141770)  But that fix introduced a new problem.

Lan Hui(1348141770)  The old, legitimate users are no longer able to login, which is equally bad as being unable to login immediately after sign up.

Lan Hui(1348141770)  The fix failed that Regression Test.

Lan Hui(1348141770)  Failing a regression test is quite normal.

Lan Hui(1348141770)  Two old users reported that they saw a Blank Page after they logged in, making them totally surprised.

Lan Hui(1348141770)  Let's take a 5-minute break.

2020-03-09 16:07:43 Guedalia Youma (3014432207)  Alright

Lan Hui(1348141770)  Where is Pacifique?

2020-03-09 16:12:59 系统消息(10000)  Twizere Pacifique 唐平撤回了一条消息

2020-03-09 16:13:12 Twizere Pacifique 唐平<pacitwizere@hotmail.com>  201925800174

Lan Hui(1348141770)  Thanks, Pacifique.

Lan Hui(1348141770)  ===================================================

Lan Hui(1348141770)  How to solve the newly introduced "Blank Page" problem?

Lan Hui(1348141770)  It turns out the solution is really simple.

Lan Hui(1348141770)  Just tweak a conditional test a bit.

Lan Hui(1348141770)  [图片]

::

    //  verify the hashed password and unhashed password
    if(password_verify($password, $row["Password"]) or ($password = $row["Password"])){

Lan Hui(1348141770)  Just relax the conditional test by adding an OR condition: ($password = $row["Password"]).

Lan Hui(1348141770)  The variable $password stores the password you entered through the LRR web form.

Lan Hui(1348141770)  $row["Password"] contains the pre-stored password which you entered during sign up.

Lan Hui(1348141770)  Of course, they have to be equal before LRR would allow you in.

Lan Hui(1348141770)  Then, you may ask, what is the point of having "password_verify($password, $row["Password"])"?

Lan Hui(1348141770)  password_verify is a built-in function in PHP.

Lan Hui(1348141770)  Well.

Lan Hui(1348141770)  This function takes password stored in a human-readable form (e.g., 'secret'), hashes it and compares the hash result with the pre-stored password $row["Password"], which is also stored in a hash form.

Lan Hui(1348141770)  Why bother with hash?

Lan Hui(1348141770)  The point is that we, the software developers, do not want, or are not allowed to store users' password in a plain form.

Lan Hui(1348141770)  By law we should not do that.

Lan Hui(1348141770)  We should never, ever store users' password in a non-encrypted form because of risk of leak and the consequent liability.

Lan Hui(1348141770)  Yahoo made that mistake a few years ago.

Lan Hui(1348141770)  We must hash people's password by law.

Lan Hui(1348141770)  For example, if my password is 'secret', then its hashed form, '2bb80d537b1da3e38bd30361aa855686bde0eacd7162fef6a25fe97bf527a25b', should be stored in our application.

Lan Hui(1348141770)  Holy cow. Who can understand '2bb80d537b1da3e38bd30361aa855686bde0eacd7162fef6a25fe97bf527a25b' even if he gets that?

Lan Hui(1348141770)  Here is a hash calculator that you can play with.

Lan Hui(1348141770)  https://www.tools4noobs.com/online_tools/hash/

Lan Hui(1348141770)  A great attribute of hash function is that it is a one-way function.

Lan Hui(1348141770)  You cannot recover 'secret' from '2bb80d537b1da3e38bd30361aa855686bde0eacd7162fef6a25fe97bf527a25b'.

Lan Hui(1348141770)  Therefore, even when '2bb80d537b1da3e38bd30361aa855686bde0eacd7162fef6a25fe97bf527a25b' is now in a bad guy's hands, it does not matter that much, since it will take him hundreds of thousands of years to get the 'secret'.

Lan Hui(1348141770)  A wise bad man won't do that.

Lan Hui(1348141770)  The additional OR conditional test is for backward compatibility.

Lan Hui(1348141770)  A bit awkward.

Lan Hui(1348141770)  Perhaps we can get rid of that conditional test in the future, to make the code simpler.

Lan Hui(1348141770)  To do so, we need to hash all passwords that are stored in plain form.

Lan Hui(1348141770)  Is it worth doing that?

Lan Hui(1348141770)  We have more than 200 accounts now in LRR.

Lan Hui(1348141770)  I think there is a programmable way to do that.

Lan Hui(1348141770)  Anyway, that is future work.

Lan Hui(1348141770)  Let us take a 5-minute break.

Lan Hui(1348141770)  ===================================================

Lan Hui(1348141770)  What have I learned from this improvement process?

Lan Hui(1348141770)  Good software takes time.

Lan Hui(1348141770)  LRR started in Fall 2018 as a graduate course project: http://lanlab.org/course/2018f/se/homepage.html 

Lan Hui(1348141770)  One year and a half have passed.

Lan Hui(1348141770)  Sustained efforts are required to build something that is really great so that people would pay to use it.

Lan Hui(1348141770)  Sustained efforts require great focus and self-discipline.

Lan Hui(1348141770)  You need at least 10 years of sustained efforts.

Lan Hui(1348141770)  That is actually a rule of thumb in almost all areas of business.

Lan Hui(1348141770)  But after 10 years, you will be good, earning billions of dollars a year.

Lan Hui(1348141770)  Breathtakingly worthwhile.

Lan Hui(1348141770)  That is about 100,000,000 dollars per year, for the previous ten years.

Lan Hui(1348141770)  However, you need to lead a very frugal life in these 10 years with no guarantee of success.

Lan Hui(1348141770)  Below is an article I want to share with you.

Lan Hui(1348141770)  https://www.joelonsoftware.com/2001/07/21/good-software-takes-ten-years-get-used-to-it/

Lan Hui(1348141770)  “The Oracle RDBMS has been around for 22 years now.  Windows NT development started 12 years ago.  Microsoft Word is positively long in the tooth; I remember seeing Word 1.0 for DOS in high school (that dates me, doesn’t it? It was 1983.)”

Lan Hui(1348141770)  Look at QQ too - it started around 1998.

Lan Hui(1348141770)  How many years have passed?

Lan Hui(1348141770)  More than 20 years!

Lan Hui(1348141770)  The current QQ is much better than the original QQ (which is a clone of OICQ).

Lan Hui(1348141770)  I would say most people (who have not taken this course) don't know GOOD SOFTWARE TEAKS 10 YEARS.

Lan Hui(1348141770)  Want to be a billionaire overnight?  No way.

Lan Hui(1348141770)  Except Facebook.

Lan Hui(1348141770)  Software is hard.  And hard things need time to polish.  As simple as that.

Lan Hui(1348141770)  [图片]

.. image:: lotus-note-user-pool.png
   :height: 100
   :alt:  number of installations of the Lotus Notes over the years


Lan Hui(1348141770)  User pool of Lotus Notes.

Lan Hui(1348141770)  It hit 55 million users in 1999.

Lan Hui(1348141770)  55 million users means lots of money and a huge impact.

Lan Hui(1348141770)  12 years have passed since 1.0.

Lan Hui(1348141770)  Yet people have already spent 5 years to arrive at 1.0.

Lan Hui(1348141770)  It is important to keep a healthy body as a programmer.

Lan Hui(1348141770)  It takes very long time to be successful and you should enjoy that day when it arrives.

Lan Hui(1348141770)  The problem of China software industry is exactly Lack of Time.

Lan Hui(1348141770)  Desire of Success + Lack of Time = ???

Lan Hui(1348141770)  Crap.

Lan Hui(1348141770)  How much money has Oracle made?

Lan Hui(1348141770)  Billions of dollars at least.

Lan Hui(1348141770)  The Oracle database system was there in 1970's.

Lan Hui(1348141770)  Joel Spolsky, the founder of Stack Overflow, is a prolific author good at writing.

Lan Hui(1348141770)  He has produced more than 1000 blog posts over a period of 10 years.

Lan Hui(1348141770)  He must have been thinking and thinking.

Lan Hui(1348141770)  Writing is Thinking.  Writing is Communicating.

Lan Hui(1348141770)  I think you should read his "Top 10" posts.

Lan Hui(1348141770)  Let's take a 5-minute break.

Lan Hui(1348141770)  After that we will talk about licenses.

2020-03-09 17:01:19 Marie(2928285277)  Okay sir

Lan Hui(1348141770)  ===================================================

Lan Hui(1348141770)  One question.

Lan Hui(1348141770)  What kind of free software license would you use if your software is an online application, i.e., you do not send people installation packages?

Lan Hui(1348141770)  License for online applications, such as Simple Note, One Note.

Lan Hui(1348141770)  Affero GPL.

Lan Hui(1348141770)  Affero GPL has an extra clause designed specifically for online applications.

Lan Hui(1348141770)  I think MIT is good too.  It is simple and permissive.

Lan Hui(1348141770)  In contrast, GPL is a copyleft license, less permissive.

Lan Hui(1348141770)  Copyleft is an interesting word.

Lan Hui(1348141770)  The exact meaning of copyleft is that it requires all its derivative work to be copyleft too.

Lan Hui(1348141770)  Some people think this is a way of defending freedom.

Lan Hui(1348141770)  ===================================================

Lan Hui(1348141770)  Quiz time.

Lan Hui(1348141770)  This is limited-time quiz which you have to submit before 5:35pm today to LRR.

Lan Hui(1348141770)

::
   
   [True/False] Free software means zero-cost software.
   [True/False] Zero-cost software cannot be proprietary.
   [True/False] If the source code is visible, then the software is open source.
   [True/False] Open source software cannot be used for commercial purposes.

Lan Hui(1348141770)  Select two and only two to answer.

2020-03-09 17:10:23 Marie(2928285277) I still can’t login to LRR

2020-03-09 17:10:26 Guedalia Youma (3014432207) Where should we submit it ? By email ?

Lan Hui(1348141770)  Bye.




Friday, 13 March 2020
=====================

*Quiz review - The Cathedral and the Bazaar - Project management software - Kanboard - Sustained maintenance efforts - Project mission - Standard code tree*

Morning section
----------------

2020-03-13 7:57:26 初阳软工171 伍泰炜(2728735169) 
[表情] 
 
2020-03-13 7:57:45 网络171许晓鹏(892376699) 
[表情] 
 
2020-03-13 8:00:05 初阳软工171 伍泰炜(2728735169) 
201736900125 
 
2020-03-13 8:00:10 软工初阳171 刘莉莉(1196448461) 
201736900108 
 
2020-03-13 8:00:17 软件工程 张珣(1955357976) 
201732120109 
 
2020-03-13 8:00:18 初阳软工171 吴贞娴(1395588359) 
201732120108 
 
2020-03-13 8:00:22 初阳软工171 余慧(945168786) 
201736900117 
 
2020-03-13 8:00:22 初阳软工171叶红霞(1655602611) 
201736900115 
 
2020-03-13 8:00:23 初阳软工171袁世家(1515245651) 
201739230123 
 
2020-03-13 8:00:23 软工初阳171周佳威<zhouwys@qq.com> 
201736900130 
 
2020-03-13 8:00:24 初阳软工171 王海榕(1012635788) 
201732120105 
 
2020-03-13 8:00:24 初阳软工171 蒋佳玲(1850424414) 
201732120103 
 
2020-03-13 8:00:28 系统消息(10000) 
初阳软工171 陈俊蕾撤回了一条消息 
 
2020-03-13 8:00:28 唐叶尔(1768559501) 
201736900111 
 
2020-03-13 8:00:30 网络171许晓鹏(892376699) 
201730210128 
 
2020-03-13 8:00:33 软件工程初阳1701 徐梦旗(2663479778) 
201732120124 
 
2020-03-13 8:00:37 初阳软工171 陈俊蕾(1223259604) 
201736900103 
 
2020-03-13 8:00:40 重新做人(1344914885) 
201736900113 
 
2020-03-13 8:00:40 软件工程 王雪洁(249795581) 
201732120106 
 
2020-03-13 8:00:44 初阳软工171 陈肖飞(1662727361) 
20173690104 
 
2020-03-13 8:00:46 蓝珲(1348141770) 大家早上好 
 
2020-03-13 8:00:52 网络171—董文文(2373706002) 
201730210303 
 
2020-03-13 8:01:00 初阳软工171 徐闰钞(374526027) 
201736900127 
 
2020-03-13 8:01:03 网络171许晓鹏(892376699) 
早上好 
 
蓝珲(1348141770) =============================================== 

蓝珲(1348141770) 我们上次课讲了开源软件的收费模式，以及开源软件的许可证。 

蓝珲(1348141770) 还做了一个Quiz。 

蓝珲(1348141770) ::

  [True/False] Free software means zero-cost software.
  [True/False] Zero-cost software cannot be proprietary.
  [True/False] If the source code is visible, then the software is open source.
  [True/False] Open Source software cannot be used for commercial purposes.
  
蓝珲(1348141770) 我觉得答案都是F。 

蓝珲(1348141770) 大家有没有不同意见的？ 

蓝珲(1348141770) Free software means zero-cost software. 说得过于绝对。 RStudio就可以收费啊。 

蓝珲(1348141770) Zero-cost software cannot be proprietary. 如果这个zero-cost是对用户来说的话，其实大家在Apple Store免费下载的很多软件都是私有的。

2020-03-13 8:05:10 计非181 王智洋(1162466610) 
201830220719 
 
2020-03-13 8:05:18 网络171-侯新苗(953957823) 
20173021034   
 
蓝珲(1348141770) Simple Note是不是私有的？ 

蓝珲(1348141770) https://simplenote.com/ 

蓝珲(1348141770) 看一下它的主页，好像没有说是open source的，许可证的信息也没有。 

蓝珲(1348141770) Simple Note下载使用是免费的，有些额外功能需要付费。 

蓝珲(1348141770) If the source code is visible, then the software is open source.  如果仅仅是代码可见，但是许可证是私有的话，就不是open source的。 

蓝珲(1348141770) Open Source software cannot be used for commercial purposes.  这个也是False。 RStudio就是例子。它有不同的收费计划（pricing plan），收费是用于商业目的。 

蓝珲(1348141770) 以上是Quiz的内容。 

蓝珲(1348141770) 我还要求你们去读课本的第二章。大家都已经读完了吧？ 

蓝珲(1348141770) https://producingoss.com/en/getting-started.html 

蓝珲(1348141770) 我估计有部分同学还没有开始读 -- 还没有开始读的要开始读起来了。 

蓝珲(1348141770) 你们中文版的那个可以做成电子书吗？ 

蓝珲(1348141770) https://producingoss.com/zh/ 

2020-03-13 8:12:34 软工初阳171 应舸(1434305984) 
哪个中文版[表情] 
 
蓝珲(1348141770) https://producingoss.com/zh/ch02.xml 

蓝珲(1348141770) 就是上面这个。 

蓝珲(1348141770) https://producingoss.com/zh/ 

蓝珲(1348141770) 把整个文件夹拷贝下来，应该是可以做成电子书的。 

蓝珲(1348141770) 大家可以试试看。我试过，没有成功。 

蓝珲(1348141770) 如果有人成功了，可以分享一下。 

蓝珲(1348141770) 因为我的英文比较好，所以英文看起来比较顺畅。 

蓝珲(1348141770) 但是阅读速度，还是读中文快的。 

蓝珲(1348141770) 中文的话，可以上下扫描。英文，只能老老实实一句一句读了。 

蓝珲(1348141770) 也有好处。 

蓝珲(1348141770) 另外一个阅读任务也出来了 

蓝珲(1348141770) http://catb.org/~esr/writings/cathedral-bazaar/cathedral-bazaar/index.html 

蓝珲(1348141770) The Cathedral and the Bazaar  

蓝珲(1348141770) 大教堂与集市 

蓝珲(1348141770) 这个是比较有名了，讲两种软件开发模式。 篇幅较长。 

蓝珲(1348141770) 我也是教这门课才看一遍，以前听说过，一直没看，以为是讲生活信仰的。 

蓝珲(1348141770) [图片]

.. image:: Cathedral-and-Bazaar-ToC.png
   :height: 100
   :alt: required reading sections


蓝珲(1348141770) 你们只需要把箭头经过的章节读一下，其他的不用读（主要在讲fetchmail的开发细节）。 

蓝珲(1348141770) 这个，中文版也是有的，但是网上说翻译的比较烂。 

蓝珲(1348141770) 确实也不好翻译。 

蓝珲(1348141770) b站的一些字幕组来翻译估计会翻译的更好。 

蓝珲(1348141770) 我们先休息5分钟。 

2020-03-13 8:21:12 软工初阳171 何可人(1461938594) 
201736900106 
 
2020-03-13 8:21:40 软工初阳171 应舸(1434305984) 
201736900128 
 
2020-03-13 8:22:21 初阳软工171方梓安(2453122992) 
201736900105 
 
蓝珲(1348141770) =============================================== 

蓝珲(1348141770) 还有其他一些好书，Peopleware 之类的。 

蓝珲(1348141770) 这个大家工作后可以读读。 

蓝珲(1348141770) [文件]

蓝珲(1348141770) 上面这个文件主要是专访熊节的文字实录。大家课后可以看看。 

蓝珲(1348141770) 不做要求。 

蓝珲(1348141770) 对了，你们的 Decide areas for improvement 还没有交。 

蓝珲(1348141770) 是我忘记在对分易创建提交目录了。 

蓝珲(1348141770) 现在已经创建，你们在下周一之前交上去。别忘了包括组员信息，这样方便我给分。这个是2分。 

蓝珲(1348141770) 看板 - Kanboard 

蓝珲(1348141770) 我想让你们用看板来管理软件项目。 

蓝珲(1348141770) 你们的账号密码我已经创建。 

蓝珲(1348141770) [图片] 

.. image:: TIM20200316180248.png
   :height: 100
   :alt: Kanboard for undergraduate thesis supervision

蓝珲(1348141770) 我的看板是长上面这个样子的。 

蓝珲(1348141770) 卡片可以拖动到不同的泳道（swim lane)。 

蓝珲(1348141770) 有4个泳道。 

2020-03-13 8:37:28 初阳软工171 伍泰炜(2728735169) 
然而这是Github已经包含的一部分功能…… 
 
蓝珲(1348141770) 原则上是“进行中(In Progress)”那个泳道卡片（任务）不能超过2个。这是为了避免 Multi-tasking。 

蓝珲(1348141770) Github只是拿来做代码版本管理的。 

蓝珲(1348141770) 看板肯定没有这个做得好。

蓝珲(1348141770) 个人观点。 

蓝珲(1348141770) 我的目的是，我要看到你们管理项目的动态。 

蓝珲(1348141770) 也许你已经有动态了，但是我不知道。 

蓝珲(1348141770) 所以你要记录下来。

蓝珲(1348141770) 看板这个功能很多团队协作工具都有的，比如Trello，JIRA。 

蓝珲(1348141770) 我们用的这个 kanboard 胜在轻量，简洁明快。 

蓝珲(1348141770) 你们以后去公司工作，可以自己部署在公司服务器。

蓝珲(1348141770) 最多花一天时间，就可以部署好了。

蓝珲(1348141770) 所以，你们从今天开始，就可以慢慢在看板上（http://118.25.96.118/kanboard）添加卡片了。 

蓝珲(1348141770) [图片] 
蓝珲(1348141770) [图片] 

蓝珲(1348141770) 每个卡片点进去是这样的。可以添加评论。 

蓝珲(1348141770) [图片] 

蓝珲(1348141770) 这个软件是个开源软件，法国人开发的，但是参与项目的人数前前后后也有200人了吧。 

2020-03-13 8:44:30 系统消息(10000) 
初阳软工171 伍泰炜撤回了一条消息 
 
2020-03-13 8:44:45 初阳软工171 伍泰炜(2728735169) 
[图片] 
 
蓝珲(1348141770) 你们登录一下试试。 

蓝珲(1348141770) 我们先休息5分钟。 

2020-03-13 8:45:40 软件工程  常思琦(995959606) 
201732120101 
 
蓝珲(1348141770) =============================================== 

蓝珲(1348141770) [图片] 

蓝珲(1348141770) 我们要做软件，首先要想想自己手里头有什么。

蓝珲(1348141770) 现在老是喊创新。 

蓝珲(1348141770) 创新哪里有那么容易。 

蓝珲(1348141770) 根据辩证法，创旧到极致就是创新。

蓝珲(1348141770) 很多所谓的创新，那叫一个惨不忍睹。

蓝珲(1348141770) 我手头上有一个软件，我要把它开源，公之于众，怎么个搞法？ 

蓝珲(1348141770) 把代码往github一扔，就完事了？ 

蓝珲(1348141770) 在现阶段，你们搞开源，其实更多的目的是对自己的一种鞭策。

蓝珲(1348141770) 看看自己有几天没有打卡了。 

蓝珲(1348141770) 比如这个 Benno Schulenberg 就是几乎天天都在打卡。 

蓝珲(1348141770) https://git.savannah.gnu.org/cgit/nano.git/log/ 

蓝珲(1348141770) [图片] 


.. image:: nano-git-log.png
   :height: 100
   :alt: Benno Schulenberg's nano maintenance activity


蓝珲(1348141770) 十年如一日的打卡，这样做出来的产品会不行？

蓝珲(1348141770) Benno Schulenberg 是在创旧啊。 

蓝珲(1348141770) 说实话，我很佩服这个老哥的做事精神。

蓝珲(1348141770) 这才是做软件，才是管理软件嘛。 

蓝珲(1348141770) 都是一行一行，实打实出来的嘛。 

蓝珲(1348141770) 开源后，要告诉这个世界你的软件是做什么用的。 

蓝珲(1348141770) 这个是 mission statement 里要包含的东西。 

蓝珲(1348141770) 还有比较重要的是描述你的软件的特色， 

蓝珲(1348141770) 与不足。 

蓝珲(1348141770) 特色大家都不会忘记。 

蓝珲(1348141770) 不足大家都不愿意提及。但是，这个确实是要提及的，而且是有帮助的。 

蓝珲(1348141770) 能够拉近人与人的距离。 

蓝珲(1348141770) 我们与圣人的距离很远，因为他的不足很少。 

蓝珲(1348141770) 我们提不足，其实是锚定期望值。 

蓝珲(1348141770) “我事先告诉你了哦，我的软件可能会随时崩溃，你可要经常存盘哦。” 

蓝珲(1348141770) 当然，我们把不足描述了以后，也是为了给以后的改进提供方向。 

蓝珲(1348141770) 介绍软件要尽量简洁明了，让别人理解你的软件。 

蓝珲(1348141770) 别炫技。 

蓝珲(1348141770) 把代码公开后，也有助你一开时就注意采取比较好的开发目录。 

蓝珲(1348141770) 不要把所有的文件都丢在一个文件夹下。 

蓝珲(1348141770) 除非你的项目只有很少的文件。 

蓝珲(1348141770) [图片] 


.. image:: courseobjectivesatisfaction-git-log.png
   :height: 100
   :alt: source tree for Course Objective Satisfaction


蓝珲(1348141770) 比如我这个，只有两个文件，所以放在一个文件夹下也可以。 

蓝珲(1348141770) 项目的名字就是 “课程目标达成度”。

蓝珲(1348141770) 不是很好的名字，是个功能性的名字。 

蓝珲(1348141770) 就是根据同学的各项成绩，算出一个班级的课程达成度。 

蓝珲(1348141770) 不过这个指标是有 bug 的。

蓝珲(1348141770) 什么bug大家自己想。(参见 Goodhart's Law)

蓝珲(1348141770) Code tree: src/, bin/, lib/, etc/, include/, test/, share/, data/, example/, doc/, README, LICENSE, COPYING, MANUAL, TUTORIAL, FAQ, ...

蓝珲(1348141770) 大型一点的软件，一般会有下面的子文件夹与文件。 

蓝珲(1348141770) Code tree就是代码的目录结构。 

蓝珲(1348141770) src里面放源代码，.c, .py, .java之类。 

蓝珲(1348141770) bin里面放可执行文件。这个一般可以提供，也可以不提供，不提供的话，要确保用户能够很容易自己生成可执行文件。 

蓝珲(1348141770) 提供的话，就要考虑不同的CPU架构、操作系统了。 

蓝珲(1348141770) etc里放些杂七杂八的东西。

蓝珲(1348141770) doc放文档。 

蓝珲(1348141770) LICENSE与COPYING选一个就好了，放许可证。 

蓝珲(1348141770) 现在我看到的情况是，COPYING用得比较多。 

蓝珲(1348141770) 这种标准化的软件项目目录是比较好的结构。 

蓝珲(1348141770) 我们休息5分钟。 

2020-03-13 9:15:03 初阳软工171 伍泰炜(2728735169) 
@蓝珲 应该没有行不行一说，Nano在做简单文本文件编辑时是不错。但不要希望用它来做复杂的编辑工作。其它的编辑器诸如'emacs','vim','gedit'都提供了文本着色以及自动文本格式化。而Nano只做最基本的编 辑操作，而不提供其它功能。而用户只要有需求就会尝试符合需求的软件。Linux平台的文本编辑器还有很多，vim，geditor，emacs等等，nano不是唯一的选择，也不能说是做的最好的。而且，nano的作者没有关心可怜的乌干达儿童。（玩笑） 
 
蓝珲(1348141770) =============================================== 

蓝珲(1348141770) 凡我不能做到的正义之事皆值得敬佩。 

蓝珲(1348141770) 10年在维护一个“简单”的东西，你说他图啥？ 

蓝珲(1348141770) 值得深思。 

蓝珲(1348141770) 下课。 

蓝珲(1348141770) 这个大家看看。 

蓝珲(1348141770) 10-year Rule https://www.joelonsoftware.com/2001/07/21/good-software-takes-ten-years-get-used-to-it/ 


.. image:: 10-year-rule-spolsky.png
   :height: 100
   :alt: Good Software Takes Ten Years. Get Used To it. JULY 21, 2001 by JOEL SPOLSKY

蓝珲(1348141770) 我们下次课讲。 

2020-03-13 9:32:23 初阳软工171 伍泰炜(2728735169) 
英雄联盟也很厉害的，他从2009年美服开服，一直维护到今天，版本号从0到10。大家也来敬佩敬佩[表情]




Monday, 16 March 2020
=====================

*Feedback on project proposal - Setting up a central code repo - Concerted management efforts - Kanboard - Project mission*

Morning section
----------------

2020-03-16 10:34:01 201732120170-Tamene Robel妈妈(3287975278)  No class?

2020-03-16 10:34:27 Saeed : 201732120146(446571011)  [表情]

2020-03-16 10:34:32 nainezz(2407048879)  Was about to ask same question

2020-03-16 10:34:34 armand(2431154023)  ?

2020-03-16 10:34:55 201732120134_Michelle(3304952232)  it starts at 10:35

2020-03-16 10:34:55 201732120170-Tamene Robel妈妈(3287975278)  Sleep guys

2020-03-16 10:34:56 ibrahim(1525200991)  break

2020-03-16 10:35:01 201732120134_Michelle(3304952232)  [表情]

2020-03-16 10:35:07 ALBOROM WARD-201732120143家长(3279308836)  10:40

2020-03-16 10:35:21 nainezz(2407048879)  @ibrahim break ??

蓝老师  ===================================================

2020-03-16 10:35:32 ibrahim(1525200991)  breakfast

蓝老师  Morning guys.  Could you type your student number?

2020-03-16 10:35:42 ibrahim(1525200991)  201732120159

2020-03-16 10:35:43 系统消息(10000)  FADHEL ABDULLAH撤回了一条消息

2020-03-16 10:35:43 陈真赐(1312502742)  201732120114

2020-03-16 10:35:47 nainezz(2407048879)  201732120173

2020-03-16 10:35:49 201732120141--AHAMED SABUJ妈妈(2686217157)  201732120141

2020-03-16 10:35:50 ALBOROM WARD-201732120143家长(3279308836)  201732120143

2020-03-16 10:35:51 软英171 陆博业(2794513466)  201732120119

2020-03-16 10:35:52 李佳兴(421281726)  201732120118

2020-03-16 10:35:55 201732120134_Michelle(3304952232)  201732120134

2020-03-16 10:35:58 叶涵涛(2289316051)  201732120125

2020-03-16 10:36:02 软英171陈伟超(937202326)  201732120113

2020-03-16 10:36:05 FADHEL ABDULLAH(3071163205)  201532120139

2020-03-16 10:36:06 杰西卡201732120133(2422938906)  201732120133

2020-03-16 10:36:14 201732120167 Clive妈妈(3321692247)   201732120167

2020-03-16 10:36:20 软英171高增(1520653544)  201732120117

2020-03-16 10:36:21 201732120157 hossain arif<charif19282@qq.com>  201732120157

2020-03-16 10:36:22 Saeed : 201732120146(446571011)  201732120146

2020-03-16 10:36:23 ABDALMUHAYMEN 201730210234(1071107298)  201730210234

蓝老师  Let's wait 4 minutes for more people to join in.

2020-03-16 10:36:37 armand(2431154023)  201732120161

2020-03-16 10:36:40 软英171 郑可富(1924773187)  201732120129

2020-03-16 10:36:51 201632120150-Ashly(1661411131)  201632120150

2020-03-16 10:36:54 Mohamed Jifry Hazzaly Mohamed爸爸(3028786026)  201732120165

2020-03-16 10:36:54 谢佳聪(1249923715)  201732120123

2020-03-16 10:37:03 LUL GUOBA RUOT (2217724540)  201632120161

2020-03-16 10:37:21 201732120170-Tamene Robel妈妈(3287975278)  201732120170

2020-03-16 10:37:31 软英171周仙龙(1748153603)  201732120130

2020-03-16 10:37:41 201732120127 张滨(2350711965)  201732120127

2020-03-16 10:38:12 Samantha 201632120140(2459455104)  201632120140

蓝老师  [Announcement]

蓝老师  You need to finish reading `The Cathedral and the Bazaar`_ by the end of this week.

.. _The Cathedral and the Bazaar: http://catb.org/~esr/writings/cathedral-bazaar/cathedral-bazaar/index.html

蓝老师  I am not going to post new readings this week.  Please finish the above reading first.

蓝老师  This reading may or may not appear in our quiz.  But it will certainly appear in our exam.

蓝老师  Take some notes while you're reading.

蓝老师  I feel Eric Raymond's writing is a bit hard to understand.

蓝老师  You do not have to read all sections, only the selected sections that I mentioned on our course home page.

蓝老师  About "Decide areas for improvement".

蓝老师  I have posted my opinions on your proposed areas for improvement.

蓝老师  http://lanlab.org/course/2020s/spm/decide-areas-for-improvement-review.html

蓝老师  I have three opinions: Accept, Half Accept and Reject.

蓝老师  In most Reject cases, the reason why I rejected your proposal is that I could not understand what you are going to do, either because your writing is too vague or too confusing.

蓝老师  If your status is Accept, you get 2 marks.

蓝老师  If your status is Accept with Conditions, you get 1 (temporarily).

蓝老师  If your status is Reject, you get 0 (temporarily).

蓝老师  I will give you a chance to revise your proposal.

蓝老师  If I finally accept your proposal, I will update your mark of this part to 2.

蓝老师  For now, I use the above marking strategy.

蓝老师  You could look at the above `big table`_ and look at other people's proposals.

.. _big table: http://lanlab.org/course/2020s/spm/decide-areas-for-improvement-review.html

蓝老师  Remember: if you submit your revised proposal (for Decide Areas for Improvement), that proposal should not duplicate the areas already mentioned in the above table.

蓝老师  We don't want duplicate efforts.

蓝老师  What is a good deadline for submitting the revised proposal?

蓝老师  (Ward, you sent that by email?  If yes, I will check.)

蓝老师  (No problem.)

蓝老师  (Some late penalty may apply.)

蓝老师  Perhaps next Monday (Mar 23) is a good deadline for submitting the revised proposal.

蓝老师  You do not need to submit your proposal again if you are in the Accept category.

蓝老师  However, please check the questions I asked (if any) in the column Instructor Comments, and answer them in your Kanboard project.

蓝老师  You should first create a project inside Kanboard (http://118.25.96.118/kanboard),

蓝老师  then create a card within that project, addressing the questions (if any) I asked.

蓝老师  That is for people in the Accept category.

蓝老师  For people in the other two categories (Accept with Conditions and Reject), you must send an updated proposal to me by next Monday 11:59pm.

蓝老师  Everyone should start using Kanboard now.

蓝老师  If you do not have an account yet, tell me that.  I will create one for you.

蓝老师  I believe most people have Kanboard accounts.

蓝老师  It seems you intend to manage either LRR or OAPS,

蓝老师  which is great.

蓝老师  The problem is that if each group manages LRR separately, we do not have a concerted management effort.

蓝老师  (OK.  For guys who are unable to login Kanboard, don't worry. I will create an account for you later today.)

蓝老师  Since Ashly has already made some improvements to LRR, is it a good idea that all people commit to his github repo?

蓝老师  Ashly will act as a gatekeeper for merging your commits.

蓝老师  Is Ashly here?  Could you do that?

蓝老师  Let's take a 5-minute break.

蓝老师  ===================================================

蓝老师  ("All of us can’t login (Kanboard)"?)

蓝老师  (Anyway, it is easy for me to change your password.)

蓝老师  (Of course, if you have made lots of failed attempts.)

蓝老师  Anyone good at github's pull request and review processes?

蓝老师  My idea is to have one (central) github repo that hosts all of our maintenance work.

蓝老师  We need a person to merge commits.

蓝老师  Is that supposed to be me?

蓝老师  We need a person to review pull requests, merge them, etc.

蓝老师  Different groups could work on different branches without interrupting each other.

蓝老师  We then regularly merge the branches back to the master branch.

蓝老师  That is the idea.

蓝老师  (You do not have to sign in Kanboard now.)

蓝老师  Of course, we can do the same thing (i.e., one central repo) for OAPS.

蓝老师  [图片]


.. image:: TIM20200316222325.png
   :height: 100
   :alt: two versions of the same software


蓝老师  The problem for OAPS is that you work on different versions (see the above picture).

蓝老师  (I think Ashly has that time.  He is almost done.)

蓝老师  It is convenient for each group to work on their own version, but the drawback is that your individual improvements could not be taken together to make a big improvement.

蓝老师  Let me think more about that.

蓝老师  Perhaps I am the one who should review your code and merge it.

蓝老师  (It doesn't matter.)

蓝老师  (You could clone it to a public repo and work on the public one.)

蓝老师  (That is not the main reason.)

蓝老师  Or, we could create a `course-level public account`_ at github so that everyone could commit there.

.. _course-level public account: https://github.com/spm2020spring

蓝老师  Anyway, send me an email if you are interested (in being the gatekeeper).

蓝老师  What is the reward?  You may ask.

蓝老师  I don't know.  Perhaps you could learn more?  Or we will have a better software?

蓝老师  Ibrahim could do that?

蓝老师  You are not working on LRR, are you?

蓝老师  Alright.  Let's say Ashly has temporarily agreed to maintain a course-level public repo for LRR, and Ibrahim for OAPS.

蓝老师  Of course, I welcome other people to join.

蓝老师  I may help too.

蓝老师  Perhaps you know more github operations that I do.

蓝老师  I kind of forget the look and feel of your OAPS, Ibrahim.

蓝老师  Could you show some screenshots?

蓝老师  If yours is good, I would suggest everyone to improve on top of your version.

蓝老师  I am going to create two course-level public github repos, one for LRR, and another for OAPS.

蓝老师  When you commit to the public repo, do not forget to include your name and student number for each commit in your commit message.

蓝老师  That is your credit.

蓝老师  It is harder for me to infer who you are from your email address.

蓝老师  (Yes. Send them to me by email.  Thanks.)

蓝老师  We talked about how to earn 1b dollars from our software 10 years later.

蓝老师  Can we earn that much from LRR or OAPS.

蓝老师  I think the chance is very remote.

蓝老师  There are better products out there.

蓝老师  For OAPS's counterpart, we have arXiv, bioarXiv, etc.

蓝老师  For LRR, we have Duifenyi, Chaoxing, etc.

蓝老师  If you are successful, you should give me some credit.

蓝老师  Let's take a 5-minute break.

蓝老师  ===================================================

蓝老师  (Learn more to earn more.)

蓝老师  No problem for LRR, since everyone starts from "scratch".

蓝老师  OAPS - most of you have already worked on a version of it.  If we choose to use Ibrahim's version, then ...

蓝老师  other people may be less familiar with that version than Ibrahim is.

蓝老师  How to solve that problem if we do want to have a central github repo?

蓝老师  Need to think more about that.

蓝老师  (Of course we can do that, but the point is that we need to merge these branches someday.)

蓝老师  If these branches are drastically different, it is very hard to merge them.

蓝老师  A better idea to start off from a Mother Branch.

蓝老师  Whose code should be the Mother Branch？

蓝老师  If we have decided a Mother Branch, then people could make their own improvements on top of that, making the merge job much easier.

蓝老师  I will check my grade book of last semester's OAPS evaluation and figure out if I can pick a Mother Branch.

蓝老师  I will browse your code too.

蓝老师  Lots of work on my side.  But I am glad to do that.

蓝老师  I remember Ibrahim's code is not that bad, isn't it?

蓝老师  Let's see.

蓝老师  Kanboard.

蓝老师  Once you have created a project inside Kanboard, could you invite me to your project so that I can monitor your progress?

蓝老师  You should also make your Kanboard public.

蓝老师  Easier for the outsider to check your status (like something shown below).

蓝老师  [图片]

.. image:: TIM20200316180248.png
   :height: 100
   :alt: Kanboard for undergraduate thesis supervision

蓝老师  (Thanks, Ibrahim.)

蓝老师  [图片]

.. image:: TIM20200316222412.png
   :height: 100
   :alt: Slide "starting from what you have"

蓝老师  That is almost every thing for today.

蓝老师  One advice is "Starting from What You Have",

蓝老师  which is exactly we are doing now.

蓝老师  We need to have a mission, and a vision.

蓝老师  Give an overview of our project.

蓝老师  What is Raspberry Pi's mission statement?

蓝老师  https://www.raspberrypi.org/

蓝老师 [图片]

.. image:: TIM20200316222452.png
   :height: 50
   :alt: Raspberry Pi's mission

蓝老师  Use one sentence to let other people hear your ping.

蓝老师  Use one sentence to let other people know why you do this project.

蓝老师  Bye.



Afternoon Section
-----------------

Lan Hui: =================================================== 
 
Lan Hui: Good afternoon.  Could you type your student number? 
 
Guedalia Youma (3014432207) Good afternoon professor  

Nicole Rutagengwa (1403962700) Good afternoon sir  

Guedalia Youma (3014432207) 201925800221 

Twizere Pacifique 唐平<pacitwizere@hotmail.com> Good Afternoon Teacher  

Nicole Rutagengwa (1403962700) 201925800169 

NGOUNOU家长(438499151) hello Sir 

Twizere Pacifique 唐平<pacitwizere@hotmail.com> 201925800174 

Tabitha(2954060050) 201925800170 

NGOUNOU家长(438499151) 201925800180 

Marie(2928285277) 201925800173 
 
Lan Hui: I would like to share with you an interesting article, on MOOC teaching methods. 
 
Lan Hui: https://www.classcentral.com/report/why-my-mooc-is-not-built-on-video/ 
 
Lan Hui: [图片: Lorena Barba.  Mar 5th, 2015.  Why My MOOC is Not Built on Video.] 
 
Lan Hui: The author's main point: "expensive, high-production-value videos are not necessary to achieve a quality learning experience."
 
Lan Hui:  " 'Lecture videos' have the same pitfalls as regular lectures: they provide a false sense of clarity and are utterly forgettable", she says.
 
Lan Hui: Very interesting.  You could save the essay for future reading.  At least I am convinced. 
 
Lan Hui: When you watch video, you enter a Passive Zone. 
 
Lan Hui: Where were we left last time? 
 
Lan Hui: I have talked about Ashly's story of a bug fix for LRR. 
 
Lan Hui: The "`Unable to sign in immediately after sign up`_" bug. 

.. _Unable to sign in immediately after sign up: http://118.25.96.118/bugzilla/show_bug.cgi?id=30


Lan Hui: All LRR bugs are here: http://118.25.96.118/bugzilla/describecomponents.cgi?product=Lab%20Report%20Repository%20%28nor%20houzi%29 
 
Lan Hui: I am happy that we have more than 40 bugs now for LRR. 
 
Lan Hui:

.. image:: LRR-all-bugs.png
   :height: 100
   :alt: Product: Lab Report Repository (nor houzi) http://118.25.96.118/bugzilla/buglist.cgi?bug_status=__all__&no_redirect=1&order=changeddate%20DESC%2Cpriority%2Cbug_severity&product=Lab%20Report%20Repository%20%28nor%20houzi%29&query_format=specific
 
Lan Hui: The above picture shows some recent bug reports.  I entered these reports, which I got from students. 
 
Lan Hui: The "Group creation error on duplicated group names" is reported by one of you guys. 
 
Lan Hui: These reports have laid a solid foundation for LRR. 
 
Lan Hui: At least I think so. 
 
Lan Hui: Software is Hard. 
 
Lan Hui: Thus I have also talked about the 10-year Rule. 
 
Lan Hui: See https://www.joelonsoftware.com/2001/07/21/good-software-takes-ten-years-get-used-to-it/ 
 
Lan Hui: [图片] 
 
Lan Hui: This is actually a VIR (Very Important Rule). 
 
Lan Hui: No one has told you that.  I believe. 
 
Lan Hui: It is important for morale. 
 
Lan Hui: "Anyway, something good does need time.  I just need to give myself more time for it to be that good." 
 
Lan Hui: You may think after knowing this rule. 
 
Lan Hui: "I just cannot believe that you could achieve something that good in one year. " 
 
Lan Hui: Policy makers think after knowing this rule, so they won't rush and set unrealistic expectations. 
 
Lan Hui: I have talked about the Affero GPL for online applications, too. 
 
Lan Hui: Online applications are a bit different from offline applications in that their source code is not distributed.  Rather, it is stored on server. 
 
Lan Hui: Customers do not download a copy of the source code. 
 
Lan Hui: Weibo and twitter are these kinds of online applications. 
 
Lan Hui: Although you may still have clients for them too. 
 
Lan Hui: Office 365 is a typical online application, although it does not come with a free and open source license. 
 
Lan Hui: I mentioned that both GPL and Affero GPL are copyleft licenses. 
 
Lan Hui: What does "copyleft" mean? 
 
Lan Hui: Something in an opposite direction from "copyright"? 
 
Lan Hui: A copyleft license says that the derivative works must grant freedoms described in the parent license. Example: GPL, Affero GPL. 
 
Lan Hui: It is like an infectious license,
 
Lan Hui: isn't it? 
 
Lan Hui: You require the derivative work to use the same (or at least compatible) license too. 
 
Lan Hui: What does derivative work mean? 
 
Lan Hui: A derivative work is a piece of work that is built upon the material of an old work. 
 
Lan Hui: In the software source code sense, a derivative software has used a piece of source code from someone else. 
 
Lan Hui: Whether that piece of source code is a file, or just a function. 
 
Lan Hui: GPL, Affero GPL -- copyleft licenses. 
 
Lan Hui: If you use GPL license in your software, other people who think this license too restrictive may be afraid to incorporate your code into their software. 
 
Lan Hui: Because if they do, their software has to use GPL-like licenses too.  Many people do not want to do that. 
 
Lan Hui: That is OK.  On the contrary, some people indeed want to do that. 
 
Lan Hui: What are non-copyleft licenses, while still being open source? 
 
Lan Hui: MIT Licenses, Apache Software License v2, and BSD license  -- non-copyleft licenses. 
 
Lan Hui: These licenses do not put as strict a restriction on derivative work as copyleft licenses do. 
 
Lan Hui: "I do not care how you are going to use my source code." 
 
Lan Hui: "Commercial, proprietary, all OK." 
 
Lan Hui: "As long as you keep the copyright notice of the original code intact." 
 
Lan Hui: Let us take a 5-minute break. 
 
Guedalia Youma (3014432207) Alright  
 
Lan Hui: =================================================== 
 
Lan Hui: Remember the Software Engineering course taught by Professor Leveson at MIT? 
 
Lan Hui: https://ocw.mit.edu/courses/aeronautics-and-astronautics/16-355j-software-engineering-concepts-fall-2005/ 
 
Lan Hui: [图片]

.. image:: Leveson-Software-Engineering-MITOCW.jpg
   :height: 100
   :alt: Software Engineering Concepts, Prof. Nancy Leveson, Fall 2005, Graduate, MIT Course Number 16.355J / IDS.341J / (formerly ESD.355J)
 
Lan Hui: The course material's license is called Creative Commons License. 
 
Lan Hui: Creative Commons License is commonly used for documents. 
 
Lan Hui: [图片] 

.. image:: CC-icon.png
   :height: 100
   :alt: Icon for Creative Commons License.

Lan Hui: If you see this toilet sign-like icon, then it means that product uses the Creative Commons License. 
 
Lan Hui: You could use the materials for free, or build materials on top of it with no problems, as long as you give credit to the original authors. 
 
Lan Hui: Very few software would use Creative Commons License.  CC is mostly for documents (I think). 
 
Lan Hui: Books can use CC License.
 
Lan Hui: What is the license of our textbook? 
 
Lan Hui: Karl Fogel. Producing Open Source Software: How to Run a Successful Free Software Project. Second Edition. 
 
Lan Hui: I believe it is under Creative Commons License. 
 
Lan Hui: Check https://producingoss.com/en/copyright.html 
 
Lan Hui: If you write a book, you could consider using this license. 
 
Lan Hui: (Graduate Life in A beautiful City in East China?)
 
Lan Hui: Creative Commons License is a very popular license in the publishing industry. 
 
Lan Hui: Let us move on to the next topic. 
 
Lan Hui: [Announcement] 
 
Lan Hui: You need to finish reading *The Cathedral and the Bazaar* by the end of this week. 
 
Lan Hui: http://catb.org/~esr/writings/cathedral-bazaar/cathedral-bazaar/index.html 
 
Lan Hui: There will be no new reading assignment this week. 
 
Lan Hui: Make a plan to finish reading the above essay, an important one in the open source world. 
 
Lan Hui: When you read, make sure you take some notes, writing down the key points, refreshing ideas, eye-opening thoughts, etc. 
 
Lan Hui: So that you could have a quick review when needed. 
 
Lan Hui: Now let's talk about "Decide areas for improvement". 
 
Lan Hui: I have posted my opinions on your proposed areas for improvement. 
 
Lan Hui: Check the following link. 
 
Lan Hui: http://lanlab.org/course/2020s/spm/decide-areas-for-improvement-review.html 
 
Lan Hui: [图片] 

.. image:: TIM20200316175023.png
   :height: 100
   :alt: Accept case

Lan Hui: [图片] 

.. image:: TIM20200316175029.png
   :height: 100
   :alt: Half Accept case

Lan Hui: 0 Reject. 
 
Lan Hui: 1 Accept with Conditions. 
 
Lan Hui: The "Accept with Conditions" proposal is proposing to provide Chinese language support. 
 
Lan Hui: Localization is best done by native speakers who master both the target language and the original language. 
 
Lan Hui: Below is my comments: While supporting Chinese is important and highly desired (see the bottom part of this link: http://lanlab.org/course/2019s/spm/user-feedback-on-LRR-implemented-by-nor-houzi-group.html), it is not my current priority since there are so many critical bugs awaiting to be solved.  I am a bit unsure about your level of Chinese. Please convince me that you could carry out the task (e.g., by which means).  If you just replace English words with Chinese words in user interface, that is not very flexible. Once the English interface has been changed, you need to do the whole thing again. I believe there is a better way to do localization. For example, Nano has a po file for each target language. See https://git.savannah.gnu.org/cgit/nano.git/tree/po/zh_CN.po You should provide a similar solution for LRR. 
 
Lan Hui: My main concern is that Bernard and Moummou do not know Chinese well enough. 
 
Lan Hui: Of course, you could argue that I don't have to know Chinese well enough to do the work. 
 
Lan Hui: Look, I have translation tools like Bing translator, Youdao translator, etc. 
 
Lan Hui: That is right.  So I don't object your proposal based solely on the language-proficiency ground. 
 
Lan Hui: That is why I gave "Accept with Conditions" rather than Reject. 
 
Lan Hui: On the technical side, you need to make sure you don't just use a Search-and-Replace approach.
 
Lan Hui: That is not flexible. 
 
Lan Hui: You should adopt a systematic method to provide the Chinese language support. 
 
Lan Hui: Nano supports Chinese too, achieved through a po file: https://git.savannah.gnu.org/cgit/nano.git/tree/po/zh_CN.po  
 
Lan Hui: This po file contains blocks like below. 
 
Lan Hui::

   #: src/browser.c:67
   #, c-format msgid "Cannot open directory: %s" msgstr "无法打开目录：%s" 
 
Lan Hui: You see. "Cannot open directory: %s" -> "无法打开目录：%s"    
 
Lan Hui: The translation is not done on the source code, but done in another file. 
 
Lan Hui: You need to familiarize with that kind of approach. 

Lan Hui: I won't accept a "Chinese version" of the source code made by a manual Search-and-Replace approach.

Twizere Pacifique 唐平<pacitwizere@hotmail.com> Teacher  I have  small question about the bug correction assignment ,  After we finish ,how are we going to submit ? , Can we have a github repository access  so that we can submit by doing pull requests , or are we going to send you the files that we have changed ? 
 
Lan Hui: That is a good question.  I will talk about that in a moment.  
 
Lan Hui: Let's take a 5-minute break first. 
 
Twizere Pacifique 唐平<pacitwizere@hotmail.com> okay  
 
Lan Hui: =================================================== 
 
Lan Hui: Returning to Pacifique's question, 
 
Lan Hui: I intend to create a course-level github account so that you could send your changes there. 
 
Lan Hui: I will use Ashly's current code as the Mother Branch, from which you could clone. 
 
Lan Hui: BTW, Ashly is an undergraduate student taking the same course. 
 
Lan Hui: The Mother Branch is in fact the master branch. 
 
Lan Hui: You clone that master branch to your local drive. 
 
Lan Hui: Work on your "features" and send pull requests for merging. 
 
Lan Hui: Are you good at pull request and code merging, Pacifique? 
 
Lan Hui: You could be one of the committers. 
 
Twizere Pacifique 唐平<pacitwizere@hotmail.com> I did not do it a lot of times , because I mostly create my own projects  
 
Lan Hui: A committer has the write permission to the central repo. 
 
Lan Hui: We could discuss that later.  It is good for you to learn that. 
 
Twizere Pacifique 唐平<pacitwizere@hotmail.com> Yes sir , It will be an honor to do be among the team  
 
Lan Hui: (Learn more to earn more.)
 
Twizere Pacifique 唐平<pacitwizere@hotmail.com> okay  
 
Lan Hui: I am not very good at advanced github operations either. 
 
Lan Hui: But I do not think that is extremely hard to learn. 
 
Lan Hui: Just try-and-error and need some extra patience. 
 
Lan Hui: The idea is that each group's small improvements should be combined to form a big improvement,
 
Lan Hui: instead of having many forks, each of which is error-prone.
 
Lan Hui: We want to have a concerted project management effort for LRR. 
 
Lan Hui: I will explain the term "fork" later.  Actually, our textbook spends a lot of time on talking about that.
 
Lan Hui: https://producingoss.com/en/social-infrastructure.html#forkability

Lan Hui: Not required now.  But you can read it if you are interested. 

Lan Hui: For Bernard and Moummou, are you guys here? 
 
NGOUNOU家长(438499151) we are here 
 
Lan Hui: You could either convince me on your ability to provide the translation as suggested in your original plan,  
 
Lan Hui: or make a new plan. 
 
NGOUNOU家长(438499151) Okay laoshi 
 
Lan Hui: [图片]

.. image:: LRR-5-bug-reports.png
   :height: 100
   :alt: LRR 5 bug reports

 
Lan Hui: Above are `five possibilities`_ that you could consider. 

.. _five possibilities: http://118.25.96.118/bugzilla/buglist.cgi?chfield=%5BBug%20creation%5D&chfieldfrom=7d&order=changeddate%20DESC%2Cbug_status%2Cpriority%2Cassigned_to%2Cbug_id&query_format=advanced 

Lan Hui: I think the feature request "Enter student numbers in batch" is particularly useful. 
 
Lan Hui: [图片] 

.. image:: TIM20200316175523.png
   :height: 100
   :alt: batch student number enrollment

Lan Hui: Now, to let LRR recognize a student, I need to manually insert his student number by operating on the backend MySQL sever.
 
Lan Hui: This is OK if I do not have many student numbers to enter. 
 
Lan Hui: But think about that.  If you are asked to enter 100 student numbers a day,
 
Lan Hui: or 3-5 student numbers each day in a week. 
 
Lan Hui: That is not efficient. 
 
Lan Hui: It would be great to have a User Interface for each instructor so that he could copy and paste any number of student numbers in a box and click submit.  Done. 
 
Lan Hui: [Hui Lan 2020-03-10 11:44:24 CST]  It would be nice if I could enter many student number to the database table: students_data.  Why?  Because what I am doing now is quite time-consuming.  I still receive many  email messages telling me they are unable to sign up (see the attached picture), therefore, I have to enter their student numbers one by one.    First, I need to login MySQL.  Second, I need to execute the following SQL statement:  insert into students_data(Student_ID, Passport_Number) values ('201925800169', '');   I believe we can do better than that.   It would be great to have a input box so that I could copy and paste any number of student numbers, separated by white-spaces, click submit, then these numbers will be written to the table students_data.  Of course, if a student number already exists, do not insert that number again.  -Hui 
 
Lan Hui: This is something Bernard and Moummou could consider. 
 
Lan Hui: =================================================== 
 
Lan Hui: Last thing for today, Kanboard. 
 
Lan Hui: Basically, I want you to plan your project and record your project management activity on Kanboard (or Kanban). 
 
Lan Hui: http://118.25.96.118/kanboard 
 
Lan Hui: [图片] 

.. image:: TIM20200316180248.png
   :height: 100
   :alt: Kanboard for undergraduate thesis supervision
	 
Lan Hui: Above is one of my Kanboard projects. 
 
Lan Hui: You see, I have 4 swim lanes, each representing a stage. 
 
Lan Hui: Each colored card represents a task. 
 
Lan Hui: I could drag the card to one of these four swim lanes. 
 
Lan Hui: [图片] 
 
Lan Hui: I could discuss inside each card (task). 
 
Lan Hui: That is everything for today. 
 
Lan Hui: I will create Kanboard accounts for you. 
 
Lan Hui: Bye. 

Marie(2928285277)    bye Sir 

Guedalia Youma (3014432207) Good bye Sir  

Twizere Pacifique 唐平<pacitwizere@hotmail.com> Good Bye Sir


Friday, 20 March 2020
=====================

*Feedback on software improvement plan - Tutorial for remote collaboration using Git and GitHub - GitHub Organizations - Do not throw away code - Starting from what you have*

Morning section
---------------


2020-03-19 18:04:04 初阳软工171 余慧(945168786) 
因为老师可能不怎么用qq，所以我在这里讲两件事情。 第一件事情是关于明天的上课形式，老师想用腾讯会议来上课，所以请同学们在明天上课前提前下载好腾讯会议的软件，完成注册（最好用自己的名字），然后加入会议  894 024 542。为避免杂音干扰课堂，入会后默认静音，请大家在需要发言的时候再打开语音。  第二件事情，可能还有同学出现没有小组的情况，我弄了个在线文档，请组长把自己小组的成员写上，如果没有组的同学可以去还缺人的小组里问问（自己的群昵称如果还没改记得改一下），如果都满了的话。。不嫌麻烦可以看看是不是还有谁没在上面的，或者自己直接写一个单独的组等着别人来找你。  894 024 542  @全体成员  
 
2020-03-19 18:04:12 初阳软工171 余慧(945168786) 
 
 
2020-03-20 8:00:43 蓝珲(1348141770) Thanks 余慧 
 
2020-03-20 8:01:25 初阳软工171 余慧(945168786) 
老师，记得进腾讯会议哦 
 
2020-03-20 8:02:40 蓝珲(1348141770) 请发一下学号 
 
2020-03-20 8:02:42 初阳软工171 伍泰炜(2728735169) 
201736900125 
 
2020-03-20 8:02:43 网络171-侯新苗(953957823) 
201730210304 
 
2020-03-20 8:02:46 初阳软工171袁世家(1515245651) 
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2020-03-20 8:02:47 软工初阳171 刘莉莉(1196448461) 
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2020-03-20 8:02:48 初阳软工171叶红霞(1655602611) 
201736900115 
 
2020-03-20 8:02:50 软工初阳171周佳威<zhouwys@qq.com> 
201736900130 
 
2020-03-20 8:02:50 唐叶尔(1768559501) 
201736900111 
 
2020-03-20 8:02:52 初阳软工171 王海榕(1012635788) 
201732120105 
 
2020-03-20 8:02:52 软件工程 王雪洁(249795581) 
201732120106 
 
2020-03-20 8:02:53 软件工程初阳1701 徐梦旗(2663479778) 
201732120124 
 
2020-03-20 8:02:53 初阳软工171 吴贞娴(1395588359) 
201732120108 
 
2020-03-20 8:02:54 软件工程  常思琦(995959606) 
201732120101 
 
2020-03-20 8:02:54 初阳软工171 徐闰钞(374526027) 
201736900127 
 
2020-03-20 8:02:55 软件工程 张珣(1955357976) 
201732120109 
 
2020-03-20 8:02:55 初阳软工171 余慧(945168786) 
201736900117 
 
2020-03-20 8:02:56 初阳软工171方梓安(2453122992) 
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2020-03-20 8:02:57 网络171许晓鹏(892376699) 
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2020-03-20 8:03:00 初阳软工171 蒋佳玲(1850424414) 
201732120103 
 
2020-03-20 8:03:00 网络171—董文文(2373706002) 
201730210303 
 
2020-03-20 8:03:01 软工初阳171 何可人(1461938594) 
201736900106 
 
2020-03-20 8:03:02 软工初阳171 应舸(1434305984) 
201736900128 
 
2020-03-20 8:03:08 初阳软工171 陈肖飞(1662727361) 
201736900104 
 
2020-03-20 8:03:18 重新做人(1344914885) 
201736900113 
 
2020-03-20 8:03:30 计非181 王智洋(1162466610) 
201830220719 
 
2020-03-20 8:06:07 初阳软工171 余慧(945168786) 
还没进来的同学记得进腾讯会议哦894 024 542 
 
2020-03-20 8:06:09 初阳软工171 余慧(945168786) 
@全体成员  

(蓝珲在腾讯会议上讲话，回答叶红霞的问题：这门课会讲具体怎么操作管理项目吗，还是主要讲理论？)

2020-03-20 8:09:03 蓝珲(1348141770) Barry W. Boehm 
 
2020-03-20 8:09:19 蓝珲(1348141770) 有一个估计 Project Effort 的公式 
 
2020-03-20 8:09:47 蓝珲(1348141770) 不要扔掉老代码。
 
2020-03-20 8:11:42 蓝珲(1348141770) The Cathedral and the Bazaar (Note: this essay discusses two development modes. The first five sections, plus Necessary Preconditions for the Bazaar Style, The Social Context of Open-Source Software, On Management and the Maginot Line and Epilog: Netscape Embraces the Bazaar, are required readings.) 
 
2020-03-20 8:14:07 蓝珲(1348141770) Hadoop 
 
2020-03-20 8:15:18 蓝珲(1348141770) Committer 
 
2020-03-20 8:15:32 蓝珲(1348141770) Central repo  
 
2020-03-20 8:15:58 蓝珲(1348141770) Reap the benefit 
 
2020-03-20 8:16:51 蓝珲(1348141770) Oceanbase 
 
2020-03-20 8:16:55 蓝珲(1348141770) 数据库 
 
2020-03-20 8:17:10 蓝珲(1348141770) MySQL 
 
2020-03-20 8:25:00 蓝珲(1348141770) 先休息5分钟 
 
2020-03-20 8:25:06 初阳软工171 余慧(945168786) 
好的 
 
2020-03-20 8:25:21 初阳软工171 陈俊蕾(1223259604) 
201736900103 
 
2020-03-20 8:25:47 初阳软工171 陈俊蕾(1223259604) 
老师不好意思，刚来迟了几分钟[表情] 
 
2020-03-20 8:30:03 蓝珲(1348141770) 我们继续。 
 
2020-03-20 8:30:14 蓝珲(1348141770) 腾讯会议不能录音吗？ 
 
2020-03-20 8:30:40 蓝珲(1348141770) 录音可以分享给晚到的同学。 
 
2020-03-20 8:30:57 计非181 王智洋(1162466610) 
好像不能，可以用手机录 
 
2020-03-20 8:31:57 蓝珲(1348141770) [图片] 
 
2020-03-20 8:32:26 蓝珲(1348141770) 10-year Rule 
 
2020-03-20 8:33:00 蓝珲(1348141770) [图片]

.. image:: TIM20200316222412.png
   :height: 100
   :alt: Slide "starting from what you have"
 
2020-03-20 8:35:05 蓝珲(1348141770) [图片] 
 
2020-03-20 8:35:11 蓝珲(1348141770) 10-year Rule提出者的blog: https://www.joelonsoftware.com/ 
 
2020-03-20 8:40:25 蓝珲(1348141770) 我对你们的软件改进计划的反馈: http://lanlab.org/course/2020s/spm/decide-areas-for-improvement-review-class02395.html 
 
2020-03-20 8:48:53 蓝珲(1348141770) 维护LRR的那组同学，你们需要通过程序去操作下面的数据库表 student_data or students_data。


2020-03-20 8:54:18 蓝珲(1348141770) 休息5分钟 
 
2020-03-20 8:54:22 蓝珲(1348141770) 一个中心源码仓库 (GitHub Organizations Repo)，用于大家协作: https://github.com/lanlab-org/LRR。 协作的教程在 https://github.com/spm2020spring/TeamCollaborationTutorial/blob/master/team.rst 
 
2020-03-20 8:54:48 蓝珲(1348141770) https://github.com/lanlab-org/ 
 
2020-03-20 9:02:37 蓝珲(1348141770) 我们继续 
 
2020-03-20 9:15:54 初阳软工171 余慧(945168786) 我们的（代码）好像下载不了 
 
2020-03-20 9:26:01 蓝珲(1348141770) 我会更新链接 http://lanlab.org/course/2020s/spm/yuye-scatterplot.zip
 
2020-03-20 9:26:04 蓝珲(1348141770) 谢谢大家 
 
2020-03-20 9:26:09 初阳软工171 余慧(945168786) 
谢谢老师了 
 
2020-03-20 9:26:13 软工初阳171 应舸(1434305984) 

.. image:: yingge-thumb-up.jpg
   :height: 20
   :alt:  Ying Ge thumb up icon



Monday, 23 March 2020
======================


Morning  section
----------------

*Discussing two improvement proposals - Kanban task - Kanban card - Tutorial for team collaboration - Master branch - Feature branch - Pull Request - Merging to master branch*

2020-03-23 10:30:40 蓝老师(1348141770) Reminder: don't forget to join our Tencent Meeting Room at 10:35am.  Meeting ID 141 329 501. 
 
2020-03-23 10:30:56 201732120161-armand(2431154023) 
Ok  
 
2020-03-23 10:31:12 Saeed : 201732120146(446571011) 
ok  
 
2020-03-23 10:31:29 KELVIN Chimtengo(3110702155) 
Oksy 
 
2020-03-23 10:31:35 ALBOROM WARD-201732120143家长(3279308836) 
Ok 
 
2020-03-23 10:31:38 201732120168_Golden(2984538488) 
[表情] 
 
2020-03-23 10:31:38 LUL GUOBA RUOT (2217724540) 
ok  
 
2020-03-23 10:33:41 Samantha 201632120140(2459455104) 
okay 
 
2020-03-23 10:35:42 201732120141--AHAMED SABUJ妈妈(2686217157) 
201732120141 
 
2020-03-23 10:35:45 郑晓钰(280768265) 
201732120110 
 
2020-03-23 10:35:45 KELVIN Chimtengo(3110702155) 
201632120149 
 
2020-03-23 10:35:47 软英171 吕伊豪(745291576) 
201732120120 
 
2020-03-23 10:35:48 陈真赐(1312502742) 
201732120114 
 
2020-03-23 10:35:52 软英171 郑可富(1924773187) 
201732120129 
 
2020-03-23 10:35:52 Mohamed Jifry Hazzaly Mohamed爸爸(3028786026) 
201732120165 
 
2020-03-23 10:35:53 201632120150-Ashly(1661411131) 
201632120150 
 
2020-03-23 10:35:53 201732120134_Michelle(3304952232) 
201732120134 
 
2020-03-23 10:35:53 ibrahim(1525200991) 
201732120159 
 
2020-03-23 10:35:53 nainezz(2407048879) 
201732120173 
 
2020-03-23 10:35:55 ABDALMUHAYMEN 201730210234(1071107298) 
201730210234 
 
2020-03-23 10:35:55 李佳兴(421281726) 
201732120118 
 
2020-03-23 10:35:58 叶涵涛(2289316051) 
201732120125 
 
2020-03-23 10:35:58 LUL GUOBA RUOT (2217724540) 
201632120161 
 
2020-03-23 10:35:59 软英171郑洪宇(1633787262) 
201732120128 
 
2020-03-23 10:35:59 软英171戴泽荣(975336710) 
201732120115 
 
2020-03-23 10:36:00 201732120157 hossain arif<charif19282@qq.com> 
201732120157 
 
2020-03-23 10:36:01 201732120127 张滨(2350711965) 
201732120127 
 
2020-03-23 10:36:03 ALBOROM WARD-201732120143家长(3279308836) 
201732120143 
 
2020-03-23 10:36:04 201732120161-armand(2431154023) 
201732120161 
 
2020-03-23 10:36:06 201732120168_Golden(2984538488) 
201732120168 
 
2020-03-23 10:36:10 201732120170-Tamene Robel妈妈(3287975278) 
201732120170 
 
2020-03-23 10:36:16 软英171高增(1520653544) 
201732120117 
 
2020-03-23 10:36:21 201732120151 Barkay sanoussi(3178573723) 
201732120151 
 
2020-03-23 10:36:24 201732120167 Clive妈妈(3321692247) 
201732120167 
 
2020-03-23 10:36:27 Samantha 201632120140(2459455104) 
201632120140 
 
2020-03-23 10:36:42 Saeed : 201732120146(446571011) 
201732120146 
 
2020-03-23 10:36:47 软英171陈金龙(864945570) 
201732120112 
 
2020-03-23 10:37:04 应宇腾(1356633192) 
201732120126 
 
2020-03-23 10:37:05 蓝老师(1348141770) =================================================== 
 
2020-03-23 10:37:19 杰西卡201732120133(2422938906) 
201732120133 
 
2020-03-23 10:37:35 201732120147 Anderson (3034352269) 
201732120147 
 
2020-03-23 10:37:37 ABDALMUHAYMEN 201730210234(1071107298) 
Good  
 
2020-03-23 10:38:48 201732120135 玛莎(3534763826) 
201732120135 
 
2020-03-23 10:41:01 杰西卡201732120133(2422938906) 
i can see it 
 
2020-03-23 10:41:01 ibrahim(1525200991) 
i can see it 
 
2020-03-23 10:41:02 软英171戴泽荣(975336710) 
1 
 
2020-03-23 10:41:03 201732120170-Tamene Robel妈妈(3287975278) 
I can see it 
 
2020-03-23 10:41:04 201732120134_Michelle(3304952232) 
I can see it 
 
2020-03-23 10:41:06 ibrahim(1525200991) 
positive 
 
2020-03-23 10:41:07 201732120141--AHAMED SABUJ妈妈(2686217157) 
i can see it 
 
2020-03-23 10:41:10 Samantha 201632120140(2459455104) 
can see it 
 
2020-03-23 10:41:13 201732120168_Golden(2984538488) 
I can see it 
 
2020-03-23 10:41:14 KELVIN Chimtengo(3110702155) 
Can see it 
 
2020-03-23 10:41:42 hamunyela(3325982083) 
201632120157 
 
2020-03-23 10:42:50 201732120161-armand(2431154023) 
Cant hear you  
 
2020-03-23 10:43:08 201732120142 Ahmed(3608360354) 
201732120142 
 
2020-03-23 10:43:35 软英171周仙龙(1748153603) 
201732120130 
 
2020-03-23 10:44:37 软英171 陆博业(2794513466) 
201732120119 
 
2020-03-23 10:44:50 ibrahim(1525200991) 
yes 
 
2020-03-23 10:44:53 郑晓钰(280768265) 
yes 
 
2020-03-23 10:45:20 谢佳聪(1249923715) 
201732120123 
 
2020-03-23 10:46:27 蓝老师(1348141770) Look at Ashly's changes at  https://github.com/Teecloudy/LRR/commits/master
 
2020-03-23 10:51:05 ibrahim(1525200991) 
yes 
 
2020-03-23 10:55:46 ibrahim(1525200991) 
yes 
 
2020-03-23 10:58:28 ibrahim(1525200991) 
i once tried to report a bug to the bug tracker of LRR, but i couldn't create an account. 
 
2020-03-23 10:58:58 ALBOROM WARD-201732120143家长(3279308836) 
Teacher should make it for you 
 
2020-03-23 10:59:03 ALBOROM WARD-201732120143家长(3279308836) 
He did it to me 
 
2020-03-23 10:59:14 ALBOROM WARD-201732120143家长(3279308836) 
Ask him to create account for you 
 
2020-03-23 10:59:48 ibrahim(1525200991) 
oh really 
 
2020-03-23 11:05:21 ibrahim(1525200991) 
@蓝老师 would you please create an account for me on Bugzilla 
 
2020-03-23 11:05:54 蓝老师(1348141770) (Talk in Tencent Meeting Room on "Decide areas for improvement")::

  http://lanlab.org/course/2020s/spm/decide-areas-for-improvement-review.html  

  Accepted Zheng Xiaoyu's proposal. 

  Rejected the following proposal.

      I want to manage the bug reports by developing a ticket
      system. This will be achieved developing 2 user panels in which
      the client side will be later on embedded in the LRR. Users can
      submit bug reports and keep in touch with the owner or
      developer. Also, a user can give a ticket priority and submit a
      screenshot of the problem. The administrator side will have a
      dashboard showing all tickets and those which are new and those
      which are already worked on. This will help the developer to
      serve better his users rather than receiving email bug reports.

  Why?

  - A ticket system is too complex as a single-person project with a
    tight time constraint.

  - A ticket system does not add too much value to LRR.  If the
    purpose of the proposal ticket system is to let people report
    bugs, we already have Bugzilla doing exactly that.
    http://118.25.96.118/bugzilla/describecomponents.cgi?product=Lab%20Report%20Repository%20%28nor%20houzi%29
    Note: Bugzilla has been around for more than 20 years.  It is
    tested and used.  It is very hard to compete with Bugzilla.

  - Receiving bug reports through email is also quite standard,
    particularly when the volume is not that large.

  - A ticket system is most useful for applications that require
    intensive and timely customer services.  LRR is not in this
    situation, and I doubt it will ever be.


  Improvement proposal ideas:

  - [Enhancement] Enhance the re-marking functionality (the most important, distinguishing feature of LRR).

  - [Defect] Line wrapping in the middle of a word (a word should not span two lines).

  - [Defect] Unable to select and copy (this makes some job really inconvenient).


2020-03-23 11:05:55 蓝老师(1348141770) Let's take a 5-minute break. 
 
2020-03-23 11:12:27 蓝老师(1348141770) =================================================== 
 
2020-03-23 11:12:32 蓝老师(1348141770) Ibrahim. 
 
2020-03-23 11:12:44 ibrahim(1525200991) 
yes 
 
2020-03-23 11:12:47 蓝老师(1348141770) Definitely I should create a Bugzilla account for you. 
 
2020-03-23 11:15:37 ibrahim(1525200991) 
I'm not working on LRR, but there is a serious bug i would like to report 
 
2020-03-23 11:18:49 蓝老师(1348141770) Welcome. 
 
2020-03-23 11:40:33 蓝老师(1348141770) (Talk in Tencent Meeting Room on Kanboard)::

  It is important to specify as much information as possible for each
  task.  The information such as Priority, Start Date, Due Date,
  Complexity, Time spent are required to generate good project
  analytics (which is done automatically for us by the Kanboard
  application).

  One great thing about a Kanboard card is that we can include a lot
  of information in it, potentially making future maintenance much
  easier because people (probably newcomers) could check that card and
  study details, such as comments, the decision-making process,
  associated files, etc.


2020-03-23 11:40:37 蓝老师(1348141770) Let's take a 5-minute break. 
 
2020-03-23 11:48:28 蓝老师(1348141770) =================================================== 
 
2020-03-23 11:48:43 ibrahim(1525200991) 
yes 
 
2020-03-23 11:48:47 ibrahim(1525200991) 
we can 
 
2020-03-23 11:48:50 杰西卡201732120133(2422938906) 
Yes 
 
2020-03-23 11:48:52 郑晓钰(280768265) 
yeah


(Talk in Tencent Meeting on team collaboration using Git and GitHub)

I have written a tutorial on team collaboration at https://github.com/spm2020spring/TeamCollaborationTutorial/blob/master/team.rst

We are going to use the feature-branching workflow.

(Demonstrate how to use that workflow).

Push changes to the local branch called Hui-improve-README.md to the central repo: https://github.com/lanlab-org/LRR/tree/Hui-improve-README.md.

Note that the central repo's master branch is not updated.

Note that the central repo's master branch is now different from the central repo's feature branch: Hui-improve-README.md.

To update the master branch, we need to create a Pull Request to request merging the changes in branch Hui-improve-README.md to master.


2020-03-23 12:02:18 蓝老师(1348141770) That's everything for today. 
 
2020-03-23 12:02:22 蓝老师(1348141770) Bye. 
 
2020-03-23 12:02:34 201732120161-armand(2431154023) 
Bye 
 
2020-03-23 12:02:36 Samantha 201632120140(2459455104) 
thank you.  bye have a great week  
 
2020-03-23 12:02:36 杰西卡201732120133(2422938906) 
Thank you  
 
2020-03-23 12:02:41 ibrahim(1525200991) 
Bye 
 
2020-03-23 12:02:43 201732120161-armand(2431154023) 
Goodnight  
 
2020-03-23 12:02:50 Saeed : 201732120146(446571011) 
bye  
 
2020-03-23 12:02:54 KELVIN Chimtengo(3110702155) 
Bye 
 
2020-03-23 12:03:10 蓝老师(1348141770) Check https://github.com/lanlab-org/LRR to see if I have successfully pushed my changes.
 
2020-03-23 12:03:11 nainezz(2407048879) 
@201732120161-armand good night ??? 
 
2020-03-23 12:03:27 201732120161-armand(2431154023) 
It’s 05am  replied to nainezz:  
 
2020-03-23 12:03:36 蓝老师(1348141770) It is under the branch named Hui-improve-README.md.
 
2020-03-23 12:03:43 Samantha 201632120140(2459455104) 
okay  
 
2020-03-23 12:04:10 nainezz(2407048879) 
@201732120161-armand then good morning   
 
2020-03-23 12:04:58 201732120134_Michelle(3304952232) 
[图片] 

.. image:: TIM20200323123829.jpg
   :height: 100
   :alt:  README.md in LRR master branch 

2020-03-23 12:05:09 201732120134_Michelle(3304952232) 
@蓝老师  
 
2020-03-23 12:05:18 hamunyela(3325982083) 
Can you please extend the deadline for the project information? I had no managed to submit last time because I had trouble logging in. 
 
2020-03-23 12:05:25 蓝老师(1348141770) Check the branch named Hui-improve-READM.md. 
 
2020-03-23 12:05:33 蓝老师(1348141770) What you showed is the master branch. 
 
2020-03-23 12:05:45 201732120134_Michelle(3304952232) 
OK @蓝老师

.. image:: TIM20200323123836.jpg
   :height: 100
   :alt:  README.md in LRR Hui-improve-README.md 

 
2020-03-23 12:06:02 ibrahim(1525200991) 
It's changed successfully 
 
2020-03-23 12:06:03 蓝老师(1348141770) Hamunyela, send me email. 
 
2020-03-23 12:06:10 hamunyela(3325982083) 
Sure. 
 
2020-03-23 12:06:38 蓝老师(1348141770) It is important that the changes are on feature branch Hui-improve-README.md (not on the master branch). 
 
2020-03-23 12:07:04 蓝老师(1348141770) I have to review these changes before I can merge them to the master branch. 
 
2020-03-23 12:07:09 201632120150-Ashly(1661411131) 
[图片] 
 
2020-03-23 12:07:14 蓝老师(1348141770) That is the main point of the feature-branching workflow - be very careful when merging changes to the master branch.
 
2020-03-23 12:07:37 ibrahim(1525200991) 
got it 
 
2020-03-23 12:07:47 蓝老师(1348141770) Use Pull(me) Request as a checkpoint before writing to the master branch. 



Afternoon section
------------------

*Screen sharing using Tencent Meeting - Discussing one improvement proposal -  Two defects in LRR - Kanboard usage demo - Getting familiar with codebase by looking at recent commits - Easier to fix errors than to find them*

2020-03-23 14:13:06 Lan Hui(1348141770) [Announcement] 
 
2020-03-23 14:13:07 Lan Hui(1348141770) Hi guys.  This afternoon we will use Tencent Meeting (for screen sharing).  Meeting ID: 132 262 218.  Does that mean you will have to install yet another app?
 
2020-03-23 15:33:24 Twizere Pacifique 唐平<pacitwizere@hotmail.com> 
Yes sir , I think we need another app for that  
 
2020-03-23 15:40:13 Lan Hui(1348141770) ===================================================  
 
2020-03-23 15:40:15 Lan Hui(1348141770) Good afternoon guys. 
 
2020-03-23 15:40:28 Lan Hui(1348141770) Could you type your student numbers below? 
 
2020-03-23 15:40:52 Twizere Pacifique 唐平<pacitwizere@hotmail.com> 
201925800174 
 
2020-03-23 15:41:20 Guedalia Youma (3014432207) 
Good afternoon Sir  
 
2020-03-23 15:41:34 Guedalia Youma (3014432207) 
201925800221 
 
2020-03-23 15:41:39 Lan Hui(1348141770) Pacifique, could you hear me on Tencent Meeting? 
 
2020-03-23 15:41:45 Twizere Pacifique 唐平<pacitwizere@hotmail.com> 
Yes  
 
2020-03-23 15:41:50 Twizere Pacifique 唐平<pacitwizere@hotmail.com> 
I can hear you  
 
2020-03-23 15:42:02 Twizere Pacifique 唐平<pacitwizere@hotmail.com> 
The sound is very good  
 
2020-03-23 15:42:35 Nicole Rutagengwa (1403962700) 
201925800169 
 
2020-03-23 15:43:12 Twizere Pacifique 唐平<pacitwizere@hotmail.com> 
Okay 
 
2020-03-23 15:43:27 Lan Hui(1348141770) Could you guys enter Tencent Meeting?  Meeting ID: 132 262 218. 
 
2020-03-23 15:43:55 Lan Hui(1348141770) I would like to share real-time screen with you. 
 
2020-03-23 15:44:40 Lan Hui(1348141770) Click this link to join: https://meeting.tencent.com/s/5oK4gUd97b8aa 
 
2020-03-23 15:44:53 Lan Hui(1348141770) Meeting ID: 132 262 218 
 
2020-03-23 15:45:42 Nicole Rutagengwa (1403962700) 
I can hear you sir  
 
2020-03-23 15:45:59 Guedalia Youma (3014432207) 
I can hear you too, the sound is good 
 
2020-03-23 15:46:07 Lan Hui(1348141770) Thank you, Nicole.  How is my sound quality? 
 
2020-03-23 15:46:21 Nicole Rutagengwa (1403962700) 
Sound is okay  
 
2020-03-23 15:48:07 Lan Hui(1348141770) I have talked about the 10-year rule in terms of software maturity and gain of users. 
 
2020-03-23 15:48:56 Lan Hui(1348141770) Why is it important to understand that rule? 
 
2020-03-23 15:49:45 Lan Hui(1348141770) [图片] 

.. image:: lotus-note-user-pool.png
   :height: 100
   :alt:  number of installations of the Lotus Notes over the years

2020-03-23 15:50:02 Lan Hui(1348141770) The X-axis is time.  
 
2020-03-23 15:50:07 Lan Hui(1348141770) The Y-axis is the number of Lotus Note users. 
 
2020-03-23 15:51:23 Lan Hui(1348141770) This rule is really important. 
 
2020-03-23 15:51:29 Lan Hui(1348141770) Most people do not know that. 
 
2020-03-23 15:52:10 Lan Hui(1348141770) I have also talked about copyleft licenses. 
 
2020-03-23 15:52:19 Lan Hui(1348141770) Example: GPL and Affero GPL. 
 
2020-03-23 15:53:18 Lan Hui(1348141770) People don't have to download source code of LRR to run the application. 
 
2020-03-23 15:53:37 Lan Hui(1348141770) LRR is an online application, so that we could use Affero GPL for it. 
 
2020-03-23 15:53:54 Nicole Rutagengwa (1403962700) 
Are we using Tencent or qq ? Or both ? 
 
2020-03-23 15:54:20 Lan Hui(1348141770) I have also talked about non-copyleft licenses, such as MIT Licenses.
 
2020-03-23 15:54:31 Kumson爸爸(3157209053) 
apparently can't access tencent from here  
 
2020-03-23 15:55:01 Lan Hui(1348141770) Thanks for letting me know that. 
 
2020-03-23 15:55:33 Lan Hui(1348141770) I will still talk in Tencent Meeting, but I will also type the script on QQ group too. 
 
2020-03-23 15:55:59 Marie(2928285277) 
201925800173 
 
2020-03-23 15:56:02 Lan Hui(1348141770) For non-code materials, such as course slides, books, tutorials, Creative Commons License is commonly used. 
 
2020-03-23 15:56:21 Marie(2928285277) 
Please how can I join the class  
 
2020-03-23 15:56:34 Lan Hui(1348141770) Actually you have already joined the class. 
 
2020-03-23 15:56:51 Marie(2928285277) 
Okay  
 
2020-03-23 15:56:52 Lan Hui(1348141770) But if you want to hear my voice, you need to join the Tencent Meeting Room. 
 
2020-03-23 15:57:09 Kumson爸爸(3157209053) 
managed to 
 
2020-03-23 15:57:24 Lan Hui(1348141770) You click this link: https://meeting.tencent.com/s/5oK4gUd97b8aa  
 
2020-03-23 15:57:41 Lan Hui(1348141770) Perhaps you will be asked to install an application. 
 
2020-03-23 15:57:50 Lan Hui(1348141770) Meeting ID: 132 262 218. 
 
2020-03-23 15:59:17 Lan Hui(1348141770) That is what we covered last time. 
 
2020-03-23 15:59:34 Lan Hui(1348141770) Today, I am going to cover the following things. 
 
2020-03-23 15:59:37 Kumson爸爸(3157209053) 
201925800166 
 
2020-03-23 15:59:45 Lan Hui(1348141770) - Decide areas for improvement. 
 
2020-03-23 16:00:16 Lan Hui(1348141770) - Kanboard. 
 
2020-03-23 16:00:29 Lan Hui(1348141770) Do you have a Kanboard account? 
 
2020-03-23 16:00:38 NGOUNOU家长(438499151) 
201925800180 
 
2020-03-23 16:01:07 Guedalia Youma (3014432207) 
No, I don't have Kanboard account 
 
2020-03-23 16:01:25 Kumson爸爸(3157209053) 
you sent th loging but couldn't  
 
2020-03-23 16:01:52 Kumson爸爸(3157209053) 
and tried to reset password and the page returned a 404 error 
 
2020-03-23 16:03:32 Guedalia Youma (3014432207) 
Yes 
 
2020-03-23 16:03:33 Twizere Pacifique 唐平<pacitwizere@hotmail.com> 
yes  
 
2020-03-23 16:04:23 Lan Hui(1348141770) [图片] 
 
2020-03-23 16:04:36 Lan Hui(1348141770) It seems I have already created an account for Kumson. 
 
2020-03-23 16:04:45 Lan Hui(1348141770) But you never successfully logged in. 
 
2020-03-23 16:04:58 Kumson爸爸(3157209053) 
yes sir 
 
2020-03-23 16:06:25 Lan Hui(1348141770) First of all, I am going to review your project proposal. 
 
2020-03-23 16:06:37 Lan Hui(1348141770) http://lanlab.org/course/2020s/spm/decide-areas-for-improvement-review.html 
 
2020-03-23 16:06:47 Lan Hui(1348141770) I will focus on Bernard's team. 
 
2020-03-23 16:07:13 Lan Hui(1348141770) They have sent me an email. 
 
2020-03-23 16:07:14 Lan Hui(1348141770)::

    From: ngounou Bernard <ngounoubernard@hotmail.com>
    Date: 2020-03-21 13:07:08
    To: "蓝珲" <lanhui@zjnu.edu.cn>
    Subject: [SPM] LRRS improvement
    
    hello Sir,
    
    After reading your proposal to create a field on your page LRRS
    (lecturer page) that should allow you to enter the number of the
    student without always connecting to the database(table
    student_data) .Me and my friend decided to do this stain. we
    apologize for waiting a few more days before pronouncing. Thank
    you for your good understanding.
    
2020-03-23 16:07:38 Lan Hui(1348141770) "the number of the student"? 
 
2020-03-23 16:07:45 Lan Hui(1348141770) I think you meant student number. 
 
2020-03-23 16:08:30 Lan Hui(1348141770) My response. 
 
2020-03-23 16:08:43 Lan Hui(1348141770)::

    Hi Bernard
    
    Entering student numbers in batch is a really useful functionality.
    
    However, the task of implementing this functionality has been taken by another group.
    
    Could you come up with another improvement plan.  Check the
    Bugzilla, which includes many unresolved bugs or feature requests.
    
    Here is a list of them:
    http://118.25.96.118/bugzilla/buglist.cgi?f1=reporter&list_id=242&o1=equals&resolution=---&v1=%25user%25
    
    Perhaps add a link under Assignments so that I can go back to the
    list of assignments is a relatively easy one:
    http://118.25.96.118/bugzilla/show_bug.cgi?id=42
    
    Thanks
    
    Hui
     
2020-03-23 16:09:21 Lan Hui(1348141770) Let's take a 5-minute break first. 
 
2020-03-23 16:10:27 Lan Hui(1348141770) In the meanwhile, could you try to enter our Tencent Meeting Room?   https://meeting.tencent.com/s/5oK4gUd97b8aa 
 
2020-03-23 16:10:40 Lan Hui(1348141770) Meeting ID: 132 262 218 
 
2020-03-23 16:12:52 Marie(2928285277) 
Sir am not able to join  
 
2020-03-23 16:14:24 Marie(2928285277) 
Can someone help me 
 
2020-03-23 16:17:46 Lan Hui(1348141770) Be patient. 
 
2020-03-23 16:20:32 Lan Hui(1348141770) =================================================== 
 
2020-03-23 16:20:36 Lan Hui(1348141770) OK.  Let's move on. 
 
2020-03-23 16:21:19 Kumson爸爸(3157209053) 
please can you just do the screen sharing here ?? 
 
2020-03-23 16:21:33 Kumson爸爸(3157209053) 
that way we can record for future use ?  
 
2020-03-23 16:22:42 Lan Hui(1348141770) We don't want duplicate work. 
 
2020-03-23 16:23:00 Lan Hui(1348141770) Check something else. 
 
2020-03-23 16:23:06 Lan Hui(1348141770) I have some suggestions for you. 
 
2020-03-23 16:23:24 Lan Hui(1348141770) First, you could check Bugzilla for bugs that you like to resolve. Also consider the following two defects.
 
2020-03-23 16:24:05 Lan Hui(1348141770) [DEFECT] Line wrap in the middle of a word.
 
2020-03-23 16:24:55 Lan Hui(1348141770) [图片] 

.. image:: TIM20200323182155.png
   :height: 100
   :alt: a word spans two lines

2020-03-23 16:25:31 Lan Hui(1348141770) The word 'project' spans two lines, with 'p' in the end of the first line, and 'roject' in the second. 
 
2020-03-23 16:26:59 NGOUNOU家长(438499151) 
ok laoshi 
 
2020-03-23 16:27:07 Lan Hui(1348141770) Bernard, you got my idea. 
 
2020-03-23 16:27:28 Lan Hui(1348141770) You should be quick, because I told the undergraduate students about in the morning section. 
 
2020-03-23 16:27:54 Lan Hui(1348141770) Your group has two members, which is a perfect size for this task in terms of workload. 
 
2020-03-23 16:28:11 Lan Hui(1348141770) If you group has 4 members, then I think this task is a bit too small. 
 
2020-03-23 16:28:47 Lan Hui(1348141770) [DEFECT] Unable to select and copy.
 
2020-03-23 16:34:54 Lan Hui(1348141770) The easiest way to start understanding the codebase is to
 
2020-03-23 16:35:12 Lan Hui(1348141770) read and understand the most recent change happened to the codebase. 
 
2020-03-23 16:35:47 Lan Hui(1348141770) Even if a codebase has 1000 lines, the change could be only 10 lines. 
 
2020-03-23 16:36:06 Lan Hui(1348141770) It is much easier to understand these 10 lines than to understand the 1000 lines. 
 
2020-03-23 16:36:28 Lan Hui(1348141770) Moreover, because it is recent, when you ask the committer questions, he would feel easy to answer them.  If the commit happened several months ago, the committer might have forgotten the details himself. 
 
2020-03-23 16:37:55 Lan Hui(1348141770) Can you see my screen? 
 
2020-03-23 16:38:12 Twizere Pacifique 唐平<pacitwizere@hotmail.com> 
Yes 
 
2020-03-23 16:48:19 Lan Hui(1348141770) [图片]


.. image:: TIM20200323182145.png
   :height: 100
   :alt:  one-character change in source code

	  
2020-03-23 16:48:30 Lan Hui(1348141770) '=' was changed to '=='.  One character change made the whole difference. 
 
2020-03-23 16:48:37 Lan Hui(1348141770) Let's take a 5-minute break. 
 
2020-03-23 16:49:23 Lan Hui(1348141770) Commit detail here: https://github.com/Teecloudy/LRR/commit/41aa01579ce4da3e408b1f05cf10117858811367 
 
2020-03-23 16:55:18 Lan Hui(1348141770) =================================================== 
 
2020-03-23 16:55:20 Lan Hui(1348141770) Move on. 
 
2020-03-23 16:57:15 Lan Hui(1348141770) Kanboard - Kanban stuff. 
 
2020-03-23 17:11:46 Lan Hui(1348141770) Bye. 
 
2020-03-23 17:12:09 Marie(2928285277) 
bye 
 
2020-03-23 17:12:31 Guedalia Youma (3014432207) 
Bye  
 
2020-03-23 17:12:32 Lan Hui(1348141770) How is my sound quality? 
 
2020-03-23 17:12:42 Lan Hui(1348141770) Bad, Good, Great? 
 
2020-03-23 17:13:01 Guedalia Youma (3014432207) 
Good  
 
2020-03-23 17:13:23 Lan Hui(1348141770) Could you see my screen clearly? 
 
2020-03-23 17:13:31 Lan Hui(1348141770) How is the screen sharing quality? 
 
2020-03-23 17:13:50 Guedalia Youma (3014432207) 
Yes Sir, good also  
 
2020-03-23 17:14:42 Marie(2928285277) 
They were both good 
 
2020-03-23 17:18:59 Twizere Pacifique 唐平<pacitwizere@hotmail.com> 
Very Good  




How to cite
=============

Is High Quality Software Worth the Cost? [MartinFowler2019]_.



References
==========



.. [MartinFowler2019]
   Martin Fowler. "Is High Quality Software Worth the Cost?".  29 May 2019.