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Galls lov og erstatningsprosjekter Johannes Brodwall Chief scientist, Steria

Galls lov og erstatningsprosjekter Johannes Brodwall Chief scientist, Steria. "If A System Is Working, Leave It Alone. Don't Change Anything!". Planen. “Systemet må erstattes!”. Leverandøren gir ikke support. Vi får ikke tak i kompetanse. Kompleksitet ødelegger vedlikeholdbarhet.

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Galls lov og erstatningsprosjekter Johannes Brodwall Chief scientist, Steria

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  1. Galls lov og erstatningsprosjekter Johannes Brodwall Chief scientist, Steria

  2. "If A System Is Working, Leave It Alone. Don't Change Anything!"

  3. Planen

  4. “Systemet må erstattes!”

  5. Leverandøren gir ikke support

  6. Vi får ikke tak i kompetanse

  7. Kompleksitet ødelegger vedlikeholdbarhet

  8. “Bygg et nytt system!”

  9. Dagens system er kravspec

  10. Estimert kostnad:85 411 timeverk

  11. (Cirka 2 livsverk)

  12. “Ikke invester i dagens system”

  13. Alt erstattes under ett

  14. Nytt system,gammel tjeneste

  15. Uortodoks observasjon #1: Det finnes billigere måter å holde liv i gammel forretningsmodell

  16. "A Complex System Designed From Scratch Never Works And Cannot Be Made To Work. You Have To Start Over, Beginning With A Working Simple System"

  17. Det finnes bedre grunner!

  18. Virkeligheten

  19. “Forsinket”

  20. “Sparket”

  21. “Vis at investeringen er verdt noe!”

  22. Produksjonsetter noe

  23. Uortodoks observasjon #2: Nytt og gammelt system vil leve sammen

  24. ... veldig gode nyheter

  25. Gradvis erstatning http://www.flickr.com/photos/wolf_359/190195652/

  26. Tekniske patterns http://www.flickr.com/photos/wolf_359/190195652/

  27. Delt database

  28. Import/eksport

  29. Datatjenestelag

  30. Parallell produksjon

  31. Krav patterns http://www.flickr.com/photos/wolf_359/190195652/

  32. Risiko

  33. Kostnad

  34. Isolert brukeregruppe

  35. Ny brukeregruppe

  36. Arkitektur http://www.flickr.com/photos/wolf_359/190195652/

  37. "...organizations which design systems ... are constrained to produce designs which are copies of the communication structures of these organizations." - Conway's Law http://www.flickr.com/photos/wolf_359/190195652/

  38. Uortodoks observasjon #3: I store prosjekter er organisering den viktigste faktoren for arkitekturen

  39. Hvor mange personer i et team? http://www.flickr.com/photos/wolf_359/190195652/

  40. 2-pizza-team http://www.flickr.com/photos/wolf_359/190195652/

  41. 10 personer med felles kodebase http://www.flickr.com/photos/wolf_359/190195652/

  42. 30 personer med integrert kodebase http://www.flickr.com/photos/wolf_359/190195652/

  43. Grensen for kontinuerlig integrasjon http://www.flickr.com/photos/wolf_359/190195652/

  44. Versjonering hindrer endring http://www.flickr.com/photos/wolf_359/190195652/

  45. Hvis jeg var sjef http://flickr.com/photos/oh_simone/2800426735/

  46. Team #1: Risiko http://flickr.com/photos/oh_simone/2800426735/

  47. Team #2: Effektivisering http://flickr.com/photos/oh_simone/2800426735/

  48. Team #3: Isolert brukergruppe http://flickr.com/photos/oh_simone/2800426735/

  49. Team #4: Portal http://flickr.com/photos/oh_simone/2800426735/

  50. Retningslinjer http://flickr.com/photos/oh_simone/2800426735/

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