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Iterative Incremental development

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This presentation describes the diferences between Iterative and Incremental development and how both combined lead to success at agile development. Furthermore it explains how requirements shoudl be broken down in smaller parts to support incremental iterative development.

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Iterative Incremental development

  1. 1. Oliver Schreck, 2012
  2. 2. Rough overview of picture Oliver Schreck, Copyright 2012 2
  3. 3. Iterative Development Develop, then evaluate, then change, … Never expected it to be right. Iterate to find the right solution. Given some good candidate solution, we might then iterate to improve a candidate solution. Oliver Schreck, Copyright 2012 3
  4. 4. Iterative Development Wikipedia:  Iteration means the act of repeating a process usually with the aim of approaching a desired goal or target or result. Each repetition of the process is also called an “iteration”, and the results of one iteration are used as the starting point for the next iteration. The whole product is iterated all the time. (This of course is in the purest iterative, non-incremental case) Oliver Schreck, Copyright 2012 4
  5. 5. 1st Iteration Oliver Schreck, Copyright 2012 5
  6. 6. 2nd Iteration Oliver Schreck, Copyright 2012 6
  7. 7. 3rd Iteration Oliver Schreck, Copyright 2012 7
  8. 8. 4th Iteration Oliver Schreck, Copyright 2012 8
  9. 9. Incremental development Incrementally add software a time Build up functionality gradually Release incrementally so that we actually get that business value were chasing. We dont really get return on investment till people begin to use the software weve built. Oliver Schreck, Copyright 2012 9
  10. 10. Incremental development Wikipedia:  Incrementalism is a method of working by adding to a project using many small, incremental changes instead of a few (extensively planned) large jumps. It means you develop one part of the system and when it’s ready you develop the next part Oliver Schreck, Copyright 2012 10
  11. 11. 1st Increment Oliver Schreck, Copyright 2012 11
  12. 12. 2nd Increment Oliver Schreck, Copyright 2012 12
  13. 13. 3rd Increment Oliver Schreck, Copyright 2012 13
  14. 14. 4th Increment Oliver Schreck, Copyright 2012 14
  15. 15. Putting both together all the phases of  Incremental development goes through development (analysis, testing, development, design, integration, production) it is a perfect tool to expose all problems in the process.  Incrementalism improves the process and adds new topics.  Iterative process means rework on the existing product.  Iterativity improves the product  Both can be used without each other but they can be used together as well. Oliver Schreck, Copyright 2012 15
  16. 16. 1st Increment and 1st Iteration Oliver Schreck, Copyright 2012 16
  17. 17. 1st Increment and 4th Iteration Oliver Schreck, Copyright 2012 17
  18. 18. 2nd Increment and Xth Iteration Oliver Schreck, Copyright 2012 18
  19. 19. 3rd Increment Oliver Schreck, Copyright 2012 19
  20. 20. 4th Increment Oliver Schreck, Copyright 2012 20
  21. 21. The different flavors  Waterfall is non- iterative, non- incremental process  Staged delivery is incremental but not iterative  Spiral model is highly iterative but not at all incremental  Agile process has many different flavors, amount of iterative and Oliver Schreck, Copyright 2012 incremental can vary 21
  22. 22. Document level Requirement  What to do rough? Specification (Customer req.)  How to do rough? System Specification (System req.)  What to do in detail? Feature Specification (Feature req.) Design Specification  How to do in detail? (Design req.) Oliver Schreck, Copyright 2012 22
  23. 23. Requirement Specification – What to do rough? CR CR CR Customer View Viewer Filming Service Oliver Schreck, Copyright 2012 23
  24. 24. System Specification – How to do rough? CR CR CR System Architecture View Viewer Filming Service Front End System req. Back End System req. Services System req. Oliver Schreck, Copyright 2012 24
  25. 25. Feature Specification – What to do in detail? CR CR CR Customer View Load Images Zoom Viewer Filming Service Front End System req. Feature req. Feature req. Back End System req. Services System req. Oliver Schreck, Copyright 2012 25
  26. 26. Design Specification – How to do in detail? Customer req. Design Load Images Feature req. Feature req. Zoom Architecture ViewDesign req. Front End System req.Design req. ViewerDesign req.Design req. Back End System req.Design req. Services System req.Design req. Oliver Schreck, Copyright 2012 26
  27. 27. After Multiple Iterations Customer req. ViewerDesign req. Front End System req.Design req. Back End System req.Design req.Design req. Services System req. Oliver Schreck, Copyright 2012 27
  28. 28. Questions?If (unclear == true) then askme(); Oliver Schreck, Copyright 2012 28

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