CS8113g: Introduction

1
The Cathedral and The Bazaar
An alternative life cycle model 2/26/99
2
Agenda

• Questions
• Remaining project activity
• Review of Raymonds essay
• Brooks revisited?

3
The Project What Remains?

• Delivered prototype (programmer)
• installation guide
• user manual
• final demo
• CM check (SQA)
• Final presentations (all)

4
Raymonds essay

• Cathedral style
• carefully crafted by individual wizards or small
  bands of mages working in splendid isolation,
  with no beta to be released before its time.
• Bazaar style
• release early and often, delegate everything you
  can, be open to the point of promiscuity - came
  as a surprise

5
Principles underlying Bazaar

• Your thoughts

6
Scratching a developers itch

• motivation for starting a project
• interesting problems are often ones that are of
  interest to you

7
Buy (modify) vs. build

• Good programmers know what to write.
• Great programmers know what to rewrite or reuse.
• Getting an A for results, not effort

8
Plan to throw one away

• Remember Brooks?
• See the 2nd system effect?

9
Importance of Users

• treating users as co-developers
• faster debugging

10
Release Early, Release Often
11
Linus Law

• Given enough eyeballs, all bugs are shallow.
• The Delphi effect
• Debugging is parallelizable

12
The importance of data

• Data structure representation is the key to good
  programming
• See also Brooks, end of Ch. 9

13
Treat co-developers well

• Keep them informed
• Stroke their egos
• Recognize their good ideas

14
Bazaar preconditions

• (Sec. 9)
• Dont start from scratch
• present a plausible promise
• Recognize good design ideas
• leaders need good people and communication skills

15
The Social Context

• egoless programming
• The Internet makes the world your talent pool

16
Apparent contradictions

• Whither the surgeon?