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Pair Programming
This document discusses pair programming, which involves two programmers working together on the same design, algorithm, code, or test. The benefits of pair programming include improved quality through continuous review, less defects through early detection, improved problem solving abilities, and higher productivity through less distraction. Pair programming also leads to better learning, team communication, and risk mitigation. Challenges include difficulty convincing stakeholders and dealing with strong individual code ownership. The document provides examples of pairing techniques and tips to implement pair programming successfully.
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Pair Programming
- 1. Pair Programming You will never work alone again! Naresh Jain naresh@agilefaqs.com Licensed Under Creative Commons by Naresh Jain 1
- 2. What is PairProgramming ? 2
- 3. Video of aSniper team working together 3
- 4. What did wesee ? Two guys working on the same task Both have the same target Both have different expertise One executes the task The other watches for external factors, evaluates the situation, corrects him and validates success after execution Two guys working as a team Licensed Under Creative Commons by Naresh Jain 4
- 5. What is PairProgramming ? 5
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- 8. Pairing Station src: ThoughtWorks India 6
- 9. Driver Pairing Station src: ThoughtWorks India 6
- 10. Driver Navigator Pairing Station src: ThoughtWorks India 6
- 11. Next line of code, syntax, API, class under dev Driver Navigator Pairing Station src: ThoughtWorks India 6
- 12. are we in the right direction?, Next line of code, requirements, alternatives, syntax, API, next test case, class under dev impact Driver Navigator Pairing Station src: ThoughtWorks India 6
- 13. Isn't it awaste ? Two developers will do the work of one Junior guys will slow down seniors Less work will get done My cost will double Why would I put two people on a job that just one can do? Licensed Under Creative Commons by Naresh Jain 7
- 14. TICO TICO (GuitarFour-Hand Exchanging) Video http://www.youtube.com/watch?v=CcsSPzr7ays 8
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- 19. How does itHelp? Licensed Under Creative Commons by Naresh Jain 13
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- 21. Less Defects Defects caughtearly 15
- 22. Improvement in the Qualityof the Design 16
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- 26. Rapid Hands-on Approach toLearning 20
- 27. Better Induction of newTeam Members 21
- 28. Better Induction of newTeam Members 22
- 29. Saved Effort onIntra- Team Documentation 23
- 30. Less Distraction leading to Higher Productivity 24
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- 32. Sustainable Pace: Helps youslow down and think 26
- 33. Better Team Building andCommunication 27
- 34. Project Management: Risk MitigationStrategy 28
- 35. We are inthe business of building software and this process requires 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
- 36. A Normal PairProgramming Video http://www.youtube.com/watch?v=q-QWdFa4awI 30
- 37. Consider the following... An experiment on Pair Programming at University of Utah Licensed Under Creative Commons by Naresh Jain 31
- 38. Cost and savings LicensedUnder Creative Commons by Naresh Jain 32
- 39. Cost and savings LicensedUnder Creative Commons by Naresh Jain 33
- 40. Cost of fixingdefects Cost of defect Time Licensed Under Creative Commons by Naresh Jain 34
- 41. Cost of fixingdefects 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
- 42. Incorporating pair-programming intoa software development process will help yield software products of better quality in less time with happier, more confident programmers! 35
- 43. Points of resistance Things to watch out for... Licensed Under Creative Commons by Naresh Jain 36
- 44. Difficulty in convincing stakeholders to let two people work on one task 37
- 45. Everyone settles down intoa “Comfort Zone” Pairing would disrupt it 38
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- 47. People Who Don’tCare 40
- 48. Developers not involved inEstimation and Planning 41
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- 50. Small Work Area (Cubicles) 43
- 51. Techniques of Pairing Licensed Under Creative Commons by Naresh Jain 44
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- 53. Keyboard n MicePairing 46
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- 57. Tips n Tricks Licensed Under Creative Commons by Naresh Jain 50
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- 59. Pair Rotation with Pair Hinging 52
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- 62. Pair Stairs 55
- 63. Spikes 56
- 64. Pairing Smells Thingsto Watch out for... Licensed Under Creative Commons by Naresh Jain 57
- 65. Pair Programming AntiPatterns Video http://www.youtube.com/watch?v=ReuFZYtGeCc 58
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- 67. Only one persondriving Distracted Pair 60
- 68. Selective Pairing closer to a Release 61
- 69. Manager decides thePairs 62
- 70. When its notnecessary? Tasks which involve Mundane Work (may be) Trivial bug fixes like Typos One person in the Pair is Sick Licensed Under Creative Commons by Naresh Jain 63
- 71. F.A.Q.s How do youdo 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
- 72. References The Costs andBenefits of Pair Programming - Laurie Williams & Alistair Cockburn Strengthening the Case for Pair-Programming - Laurie Williams, Robert R. Kessler, Ward Cunningham & Ron Jeffries On the Economic Feasibility of Pair Programming - Hakan Erdogmus & Laurie Williams Licensed Under Creative Commons by Naresh Jain 65
- 73. Thank You! Questions? Licensed Under Creative Commons by Naresh Jain 66