This is my first presentation at TU-Berlin.

1. [Pair Programming]
Ghezal Ahmad “Zia”
3/24/2011 Pair Programming 1

2. Forward
2
 This presentation, represent a research result which is
prepared by Stuart Wray at Royal School of Signals,
Blandford, United kingdom, that defines why pair
programming sometimes brings benefit and sometimes
does not.
Pair Programming 3/24/2011

3. Outline
3
 Motivation
 Pair Programming approach
 Characteristic of pair programming
 Advantages of Pair Programming
 Conclusion
Pair Programming 3/24/2011

4. What Pair Programming is?
4 Motivation
Pair programming is a style of programming in which two
programmers work side by side at one computer, continually
collaborating on the same analysis, design, algorithm,
implementation, code, or test.
Pair Programming 3/24/2011

5. How does Pair Programming work?
5 Pair programming approach
• Driver
– “Driver” has control of the keyboard and focuses on the
immediate task of coding.
• Navigator
– Tactical defects (syntax errors, calls to wrong method)
– Strategic error (heading down wrong path)
Pair Programming 3/24/2011

6. 6
 Why Pair programming is sometimes useful and
sometimes doesn't?
Pair Programming 3/24/2011

7. How does Pair Programming work?
7 Pair programming approach
Driver
Navigator
Pair Programming 3/24/2011

8. Pair…
8 Pair programming approach
Pair Programming 3/24/2011
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9. Pair…
9 Pair programming approach
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Pair Programming 3/24/2011

10. Pair…
10 Pair programming approach
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Pair Programming 3/24/2011

11. Abstraction
11 Characteristics of Pair Programming
 Pair Pressure
– Keep each other on task and focused
– Don’t want to let partner down
 Pair Negotiation
– Have shared goals and plans
– Bring different prior experiences to the task
– Different access to task relevant information
– Must negotiate a common shared of action
Pair Programming 3/24/2011

12. 12 Characteristics of Pair Programming
[1] Pair Programming 3/24/2011

13. 13 Characteristics of Pair Programming
 Pair Programming would drive me crazy.
Pair Programming 3/24/2011

14. Two head is better than one
14 Characteristics of Pair Programming
Pair Programming 3/24/2011

15. Immediate Objections
15 Characteristics of Pair Programming
• Why use two programmers to do the work that one
can do?
• Programmers prefer to work in isolation.
• Egos and disagreements about implementation will
hinder development.
Pair Programming 3/24/2011

16. 16 Characteristics of Pair Programming
Objection 1: Why use two programmers to do the
work that one can do?
Pair Programming 3/24/2011

17. Objection 1
17 Characteristics of Pair Programming
• Brainstorming
– Produce higher quality designs.
– Catch design flaws early on, different approaches to the
solution.
• Problem Isolation
– Easier for two to find and resolve a problem.
– Both thinking about problem differently.
• Focus
– Keep each other on track.
– Different experience levels
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18. 18 Characteristics of Pair Programming
Objection 2: Programming is solitary work..
Pair Programming 3/24/2011

19. Objection 2
19 Characteristics of Pair Programming
• Common assumption
– Traditionally taught and practiced this way
• Takes some adjustment
– Most are initially skeptical
• Teamwork
_ Pairs produced higher quality code
Pair Programming 3/24/2011

20. 20 Characteristics of Pair Programming
Objection 3: Egos and disagreements will
hinder development.
Pair Programming 3/24/2011

21. Objection 3
21 Characteristics of Pair Programming
• Occasionally an issue.
– Rarely have dysfunctional pairs
– Disagreements can be easily resolved by a third
party
Pair Programming 3/24/2011

22. Advantages
22 Advantage of Pair Programming
• Learn more about the system and software development.
• Problems are solved quicker.
• Coding Standards followed more closely.
• Team communication and cohesiveness.
• Enhanced productivity
• Shorter and better code
• Less bugs
• Sharing of knowledge
Pair Programming 3/24/2011

23. Important term
23 Conclusion
 Is a method of programming that has come from the
agile methodology of Extreme Programming (XP) .
 Better distribution of inner knowledge
 More team spirit
 A good idea to rotate pairs
 Two pair with refresh eyes
 Pair Programming is very effective:
In term of time
In term of quality
Pair Programming 3/24/2011

24. 24
Thanks for your attention!
3/24/2011 Pair Programming 24

25. References
25
[1] Cockburn and Williams. The Costs and Benefits of Pair Programming.
[http://collaboration.csc.ncsu.edu/laurie/Papers/XPSardinia.PDF]
[2] Jensen, Randal. A Pair Programming Experience.
CrossTalk. Mar, 2003.
[http://www.stsc.hill.af.mil/crosstalk/2003/03/jensen.html]
[3] Pair Programming. Cunningham & Cunningham, Inc. Jan. 15, 2006.
[http://www.c2.com/cgi/wiki?PairProgramming]
[4] Williams, Kessler, Cunningham. Strengthening the Case for Pair-
Programming.
[http://www.cs.utah.edu/~lwilliam/Papers/ieeeSoftware.PDF]
[5] http://collaboration.csc.ncsu.edu/laurie
Pair Programming 3/24/2011

26. 26
Question?
Pair Programming 3/24/2011

27. 27
YOU WILL NEVER WORK ALONE NOW!
3/24/2011 Pair Programming 27