How does pair programming work?

[Pair Programming]
Ghezal Ahmad “Zia”

3/24/2011 Pair Programming 1

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

Outline
3

 Motivation
 Pair Programming approach
 Characteristic of pair programming
 Advantages of Pair Programming
 Conclusion


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.


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)


6

 Why Pair programming is sometimes useful and
sometimes doesn't?


How does Pair Programming work?

Driver
Navigator


Pair…

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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



[1] Pair Programming 3/24/2011


 Pair Programming would drive me crazy.


Two head is better than one


Immediate Objections

• 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.



Objection 1: Why use two programmers to do the
work that one can do?


Objection 1
• 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



Objection 2: Programming is solitary work..


Objection 2

• Common assumption
– Traditionally taught and practiced this way

• Takes some adjustment
– Most are initially skeptical

• Teamwork
_ Pairs produced higher quality code



Objection 3: Egos and disagreements will
hinder development.


Objection 3

• Occasionally an issue.
– Rarely have dysfunctional pairs
– Disagreements can be easily resolved by a third
party


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


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

24

Thanks for your attention!


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


26

Question?


27

YOU WILL NEVER WORK ALONE NOW!


How does pair programming work?

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