how does pair programming work?

[Pair Programming]

Ghezal Ahmad “Zia”

3/24/2011 1Pair Programming

Forward

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.

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Pair Programming

Outline

3/24/2011Pair Programming

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Motivation

Pair Programming approach

Characteristic of pair programming

Advantages of Pair Programming

Conclusion

What Pair Programming is?


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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.

Motivation


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• 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)

How does Pair Programming work?Pair programming approach


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Why Pair programming is sometimes useful and

sometimes doesn't?


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NavigatorDriver

Pair programming approach

How does Pair Programming work?

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Pair…Pair programming approach

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Pair Programming

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Pair Programming

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Pair Programming


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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

Characteristics of Pair Programming

Abstraction

[1]


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Pair Programming

Pair Programming would drive me crazy.


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Pair Programming

Two head is better than oneCharacteristics of Pair Programming

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Pair Programming

Immediate Objections


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• 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?


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Pair Programming


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• 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 1Characteristics of Pair Programming

Objection 2: Programming is solitary work..


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Pair Programming

Objection 2


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• 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.


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Pair Programming

Objection 3


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• Occasionally an issue.

– Rarely have dysfunctional pairs

– Disagreements can be easily resolved by a third

party


Advantages


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• 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

Advantage of Pair Programming

Important term

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

Conclusion

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Pair Programming

Thanks for your attention!

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References


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[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

Question?

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Pair Programming

YOU WILL NEVER WORK ALONE NOW!

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how does pair programming work?

Education