Pair Programming

Pair Programming You will never work alone again! Naresh Jain naresh@agilefaqs.com Licensed Under Creative Commons by Naresh Jain 1

What is Pair Programming ? 2

Video of a Sniper team working together 3

What did we see ?Two guys working on the same taskBoth have the same targetBoth have different expertiseOne executes the taskThe other watches for external factors, evaluates the situation,corrects him and validates success after executionTwo guys working as a team Licensed Under Creative Commons by Naresh Jain 4

What is Pair Programming ? 5

src: ThoughtWorks India 6

Pairing Stationsrc: ThoughtWorks India 6

Driver Pairing Stationsrc: ThoughtWorks India 6

Driver Navigator Pairing Stationsrc: ThoughtWorks India 6

Next line of code, syntax, API, class under dev Driver Navigator Pairing Stationsrc: ThoughtWorks India 6

are we in the right direction?, Next line of code, requirements, alternatives, syntax, API, next test case, class under dev impact Driver Navigator Pairing Stationsrc: ThoughtWorks India 6

Isnt it a waste ?Two developers will do the work of oneJunior guys will slow down seniorsLess work will get doneMy cost will doubleWhy would I put two people on a job that just one can do? Licensed Under Creative Commons by Naresh Jain 7

TICO TICO (Guitar Four-Hand Exchanging) Video http://www.youtube.com/watch?v=CcsSPzr7ays 8

How does it Help? Licensed Under Creative Commons by Naresh Jain 13

Continuous Review 14

Less DefectsDefects caught early 15

Improvement in theQuality of the Design 16

Better Problem Solving 17

More Economical 18

“Pair-Pressure”ensures timely delivery 19

Rapid Hands-onApproach to Learning 20

Better Induction ofnew Team Members 21

Better Induction ofnew Team Members 22

Saved Effort on Intra-Team Documentation 23

Less Distraction leading to Higher Productivity 24

Improved Satisfaction 25

Sustainable Pace:Helps you slow down and think 26

Better Team Buildingand Communication 27

Project Management:Risk Mitigation Strategy 28

We are in the business of building software and this processrequires craft and skill, rather than a series of manual steps. Programming requires lot of thinking, creating abstractions, ﬁguring out the logic and trying out things.An evolutionary, iterative and collaborative process. Its a lot more than just typing code. (Using the keyboard or even worse, using the mouse) 29

A Normal Pair Programming Videohttp://www.youtube.com/watch?v=q-QWdFa4awI 30

Consider the following... An experiment on Pair Programming at University of Utah Licensed Under Creative Commons by Naresh Jain 31

Cost and savingsLicensed Under Creative Commons by Naresh Jain 32

Cost and savingsLicensed Under Creative Commons by Naresh Jain 33

Cost of ﬁxing defectsCost of defect Time Licensed Under Creative Commons by Naresh Jain 34

Cost of ﬁxing defects Cost of defect Time“IBM reported spending about $250 million repairing and reinstalling ﬁxes to 30,000 customer-reported problems. That is over $8,000 for each defect!” - “A Discipline for Software Engineering”, 1995, Humphrey, W.S. Licensed Under Creative Commons by Naresh Jain 34

Incorporating pair-programming into asoftware development process will help yield software products of betterquality in less time with happier, more conﬁdent programmers! 35

Points of resistance Things to watch out for... Licensed Under Creative Commons by Naresh Jain 36

Difﬁculty in convincing stakeholders to let twopeople work on one task 37

Everyone settles downinto a “Comfort Zone”Pairing would disrupt it 38

Strong Code Ownership 39

People Who Don’t Care 40

Developers not involvedin Estimation and Planning 41

InconsistentWorkstation Setup 42

Small Work Area (Cubicles) 43

Techniques of Pairing Licensed Under Creative Commons by Naresh Jain 44

Ping-Pong Pairing 45

Keyboard n Mice Pairing 46

Selective Pairing 47

Cross functional Pairing 48

Distributed Pairing 49

Tips n Tricks Licensed Under Creative Commons by Naresh Jain 50

Pairing Stations 51

Pair Rotation with Pair Hinging 52

PromiscuousPair Programming 53

Pairing Round 54

Pair Stairs 55

Spikes 56

Pairing Smells Things to Watch out for... Licensed Under Creative Commons by Naresh Jain 57

Pair Programming Anti Patterns Videohttp://www.youtube.com/watch?v=ReuFZYtGeCc 58

No Pair Rotation 59

Only one person driving Distracted Pair 60

Selective Pairing closer to a Release 61

Manager decides the Pairs 62

When its not necessary?Tasks which involve Mundane Work (may be)Trivial bug ﬁxes like TyposOne person in the Pair is Sick Licensed Under Creative Commons by Naresh Jain 63

F.A.Q.sHow do you do estimation? Its 2 people working on one task now.How do you do performance reviews for individuals?Can we keep it optional for some people on a team? Licensed Under Creative Commons by Naresh Jain 64

ReferencesThe Costs and Beneﬁts of Pair Programming - Laurie Williams & Alistair CockburnStrengthening the Case for Pair-Programming - Laurie Williams, Robert R. Kessler, Ward Cunningham & Ron JeffriesOn the Economic Feasibility of Pair Programming - Hakan Erdogmus & Laurie Williams Licensed Under Creative Commons by Naresh Jain 65

Thank You!Questions? Licensed Under Creative Commons by Naresh Jain 66

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Pair Programming

by Naresh Jain on Jun 09, 2008

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Pair Programming — Presentation Transcript