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why agile?


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My presentation at NASSCOM Tech Series session on Agile Methodology at NOIDA on Jan 17.

Published in: Technology
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  • @krishnanvinod Even in flight control systems or medical systems, companies are exploring how agile methods could help them improve time to market or improve product quality by getting early feedback from customers on functional and non-functional requirements, or reduce the risk of large-scale integration by doing early and continuous integration, or validate some key design assumptions earlier in the day, and so on. I think irrespective of what methods you use, the key idea is to identify a hypothesis and quickly validate it - that is a powerful way to build systems when requirements are not known very well. And in today's world, even the traditional domains are finding that doing 'big requirements up front' doesn't work so well - there are so many moving parts along the development cycle that necessitate the need to acknowledge them and incorporate them in development cycle.
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  • Hi TV,

    Do you believe Agile is the way for SW development? I think in some niche areas like flight control systems or medical systems - the waterfall methodology - where all requirements are completely etched out makes sense. I don't have first hand experience and so the question...

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why agile?

  1. why agile? Tathagat Varma Sr. Director Yahoo!
  2. the world around us…yesterday!
  3. Microsoft Windows timeline
  4. Other major OS and tools timeline
  5. A typical support timeline
  6. As a contrast, what are consumer internet companies doing? Continuous Integration -> Continuous Delivery -> Continuous Deployment On ‘good days’, Flickr releases a new version every half an hour (Jun 20, 2005) IMVU pushes a revision of code to the website every nine minutes (Feb 10, 2009) The other day we passed product release number 25,000 for WordPress. That means we’ve averaged about 16 product releases a day, every day for the last four and a half years! (May 19, 2010) A new version of Google Chrome now due every six weeks (Jul 22, 2010) Facebook does code push twice a day (Aug 4, 2012)
  7. adoption @ net speed!!!
  8. darwin at work on internet 2006 2009
  9. yet, our product development sucks!
  10. Let’s understand the ‘craft’ first…  Sheer joy of making things  Pleasure of things that are useful to other people  Fascination of fashioning complex puzzle- like objects of interlocking moving parts and watching them work in subtle cycles  Joys of always learning, which sprints from the non-repeating nature of the task  Delight of working in such a tractable mediumThe Mythical Man Month – Fred Brooks, 1975
  11. software development life cycles Ad-hoc Serial Iterative Incremental Iterative/Incremental
  12. risk management in SDLCs
  13. notion of ‘progress’ vs. time
  14. Waterfall Model Wrongly inspired by assembly-line manufacturing processes of the day Economics supported ―measure twice, cut once‖ leading to up-front planning and BDUF Single-pass, sequential process with hand-offs and feedback loops between adjoining phases Transition to next phase only upon completion of current phase
  15. Waterfall Software Development Limitations and Assumptions 1. Wrong analogy: Software development ≠ Production 2. Customers know EVERYTHING upfront and that requirement won‘t change 3. Legacy from the past: implicitly assumes CPU time is costly, so focuses on doing everything upfront to minimize ‗machine time‘ for trial and error 4. ―Wicked Problem‖: Designers and developers know how exactly how to build 5. Very long feedback cycles not suitable for today‘s pace of innovationPicture from
  16. As a result, software is… Costly Buggy Late
  17. and the costs…?
  18. Holy Grail of Software Development  Better: higher quality, more reliability, higher performance, more usable…  Faster: speedier development  Cheaper: no budget
  19. But the reality?
  20. Preamble to Agile MovementSoftware Crisis, 1965-85: The major cause of thesoftware crisis is that the machines have becomeseveral orders of magnitude more powerful! To put itquite bluntly: as long as there were nomachines, programming was no problem at all; whenwe had a few weak computers, programmingbecame a mild problem, and now we have giganticcomputers, programming has become an equallygigantic problem. — Edsger Dijkstra, The HumbleProgrammer
  21. Software CrisisThe causes of the software crisis were linked tothe overall complexity of hardware and thesoftware development process. The crisismanifested itself in several ways: Projects running over-budget. Projects running over-time. Software was very inefficient. Software was of low quality. Software often did not meet requirements. Projects were unmanageable and code difficult to maintain. Software was never delivered.
  22. and the response?Frameworks, Standards and Certifications
  23. …and the result?…good start…
  24. …but poor finish!
  25. and sadly, none of these came out of ‘process factories’… 2011 - • Instagram 2000-2010 •2010: Pinterest, SnapDeal, •2009: Square, Quora, Sina Weibo 1975-2000 •2008: Groupon, AirBnB, GoGo •2000: Baidu •1997: Yandex •2007: •1994: Yahoo!, Amazon, Dropbox, Zynga, Flipkart, InMobi, Hul NetScape, u, Tumblr, •1986: Pixar •2006: Twitter, SlideShare, Badoo •1984: Sybase Spotify •1983: Intuit, Borland, •1982: Sun, Symantec, Adobe, •2005: YouTube, Renren EA •2004: Facebook •1980: Informix •1979: EMC •2003: •1977: Oracle Myspace, Skype, Rovio, Gameforge, •1976: CA, Apple •2002: LinkedIn •1975: Microsoft •2001: StumbleUpon,
  26. Why? Process: Long-lead development process ineffective in a dynamic and global world Management: Command and control model unsuitable for fostering collaboration required to solve complex problems Technology: Advancements in computers, compiler technology and debugging and testing tools greatly improved the economics of software development Innovation: in the age of hyper-innovation, old processes were simply ineffective
  27. What is the most important part in these two machines? ―The Brakes!!!‖ They let you go faster…
  28. Agility vs. Discipline?
  29. Advent of Agile and Lean Methodologies 1970: Royce critiques Waterfall and offers improvement ideas 1986: Barry Boehm proposes Spiral Model 1971: Harlan Mills proposes Incremental Development 1987: Cleanroom Software engineering 1991: Sashimi Overlapping Waterfall Model 1992: Crystal family of methodologies 1994: DSDM 1995: Scrum 1996: Rational Unified Process framework 1997: Feature Driven Development 1999: Extreme Programming Explained 2001: Agile Manifesto is born 2003: Lean Software Development 2005: PM Declaration of Interdependence 2007: Kanban-based software engineering 2008: Lean Startup 2009: Scrumban 20xx: Something new !?! (hopefully!)
  30. What is agile really all about? • Empowered individuals • Collaboration Motivated • Democratic decision- Individuals making and transparency Self- • Shorter feedback cycleorganizing • Manage changing x-functional priorities Teams • Increased productivity Agile Businesses • Higher ROI • Faster time to market • Better User Experience
  31. Why is it so hard?52 39 34 % % %Organizational Resistance to Management Culture Change Support
  32. feedback loop in agile lifecycles
  33. from daily builds to project
  34. Scrum
  35. What’s happening here?
  36. Feedback Loops in TraditionalTechniques vs. Agile Techniques
  37. Agile Development Value Proposition
  38. Does Agile work?
  39. does iterating help?
  40. are small teams more productive?
  41. does colocation impact team performance?
  42. is small batch size faster?
  43. Let’s build a car …and I need it delivered… next week!
  45. The Wikispeed Process At WIKISPEED, some of our projects move more than 10,000% faster than industry norms because of our blend of Agile, Lean, Scrum, and Extreme Programming/Manufacturing practices. Team WIKISPEED uses methods developed by the fastest-moving software companies. In fact, in many ways we have more in common with Google or Twitter than with GM or Toyota. Manufacturing and old-thought software teams gather requirements, design the solution, build the solution, test the solution, then deliver the solution. In existing automotive companies, the design portion of that process alone takes 3 to 12 years, and then the vehicle design is built for 5 to 14 years. This means it is possible to buy a brand new car from a dealer and that car represents the engineering teams understanding of what the customer might have wanted 26 years ago! Team WIKISPEED follows the model of Agile software teams, compressing the entire development cycle into one-week "sprints." We iterate the entire car every 7 days, meaning that every 7 days we reevaluate each part of the car and reinvent the highest-priority aspects, instead of waiting 8 to 26 years to upgrade.
  46. Wikispeed uses… Lean Software Design: Use less stuff XP: Pairing and Swarming Agile: Reducing costs to make changes Scrum: Clearly defined team roles and responsibilities TDD: start with failing tests and develop solutions OOP: contract-first development
  47. Recap agile ≠ Faster, but Sooner agile ≠ No planning, but Adaptive Planning agile ≠ More work, but ‗Done‘ agile ≠ No documentation, but Just Enough agile doesn‘t just change the development process, but bring a radical change in organizational culture, leadership and management practices that is more in line with business needs and social values and norms of today
  48. It’s not about the method!A photographer went to asocialite party in New York. Ashe entered the front door, thehost said ‘I love your pictures– they’re wonderful; you musthave a fantastic camera.’He said nothing until dinnerwas finished, then: ‘That wasa wonderful dinner; you musthave a terrific stove.’ – Sam Haskins
  49. Connect Blog: Twitter: