Event Storming for Fun and Profit

Dan has been using Event Storming in a number of different contexts recently. He used it to model a legacy system, to design a new system, to understand several convoluted business processes, and primarily as an exercise in building shared understanding. He has also been coaching others and learning some surprising things about organisations. This session is a gentle introduction to Event Storming, some tips to help it along, and an experience report of Dan's recent adventures using it. Event Storming might just be the best thing since sliced domains.

Transcript

1. Event Storming
   for fun and profit
   Dan North
   @tastapod
   

   View Slide

2. @tastapod
   Once upon a time…
   Dan decided to
   explain Event
   Storming
   

   View Slide

3. @tastapod
   Once upon a time…
   Dan decided to
   explain Event
   Storming
   Dan
   

   View Slide

4. @tastapod
   Until finally…
   the audience
   could try Event
   Storming
   for fun and profit
   Once upon a time…
   Dan decided to
   explain Event
   Storming
   Dan
   

   View Slide

5. @tastapod
   Until finally…
   the audience
   could try Event
   Storming
   for fun and profit
   Once upon a time…
   Dan decided to
   explain Event
   Storming
   Dan
   The
   audience
   

   View Slide

6. @tastapod
   Until finally…
   the audience
   could try Event
   Storming
   for fun and profit
   Once upon a time…
   Dan decided to
   explain Event
   Storming
   Alberto invited
   Dan to speak at
   DDDx 2016
   Alberto
   Dan
   The
   audience
   

   View Slide

7. @tastapod
   Until finally…
   the audience
   could try Event
   Storming
   for fun and profit
   The audience
   understood the
   basic mechanics of
   Event Storming
   Once upon a time…
   Dan decided to
   explain Event
   Storming
   Alberto invited
   Dan to speak at
   DDDx 2016
   Alberto
   Dan
   The
   audience
   

   View Slide

8. @tastapod
   Until finally…
   the audience
   could try Event
   Storming
   for fun and profit
   The audience
   understood the
   basic mechanics of
   Event Storming
   W
   hat if
   people have
   questions?
   Once upon a time…
   Dan decided to
   explain Event
   Storming
   Alberto invited
   Dan to speak at
   DDDx 2016
   Alberto
   Dan
   The
   audience
   

   View Slide

9. @tastapod
   Until finally…
   the audience
   could try Event
   Storming
   for fun and profit
   The audience
   learned about
   Event Storming a
   legacy application
   The audience
   understood the
   basic mechanics of
   Event Storming
   W
   hat if
   people have
   questions?
   Once upon a time…
   Dan decided to
   explain Event
   Storming
   Alberto invited
   Dan to speak at
   DDDx 2016
   Alberto
   Dan
   The
   audience
   

   View Slide

10. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invited
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    

    View Slide

11. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invited
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    

    View Slide

12. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    picked up some
    useful advice
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invited
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    

    View Slide

13. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    picked up some
    useful advice
    The audience
    understood
    some of the
    behaviours they
    could expect
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invited
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    

    View Slide

14. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    picked up some
    useful advice
    The audience
    understood
    some of the
    behaviours they
    could expect
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invited
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    W
    hat am
    I
    forgetting?
    

    View Slide

15. @tastapod
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

16. @tastapod
    A domain
    event
    happened
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

17. @tastapod
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

18. @tastapod
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

19. @tastapod
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

20. @tastapod
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    Someone has
    a puzzle
    or question
    An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

21. @tastapod
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    Someone has
    a puzzle
    or question
    A view or
    “read model”
    An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

22. @tastapod
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    Someone has
    a puzzle
    or question
    “They all
    lived happily
    ever after”
    A view or
    “read model”
    An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

23. @tastapod
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    Someone has
    a puzzle
    or question
    “They all
    lived happily
    ever after”
    “Once upon
    a time…”
    A view or
    “read model”
    An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

24. @tastapod
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    Someone has
    a puzzle
    or question
    Time
    “They all
    lived happily
    ever after”
    “Once upon
    a time…”
    A view or
    “read model”
    An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

25. @tastapod
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    Someone has
    a puzzle
    or question
    Time
    “They all
    lived happily
    ever after”
    “Once upon
    a time…”
    ?
    A view or
    “read model”
    An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

26. @tastapod
    More space than you think you need
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    Someone has
    a puzzle
    or question
    Time
    “They all
    lived happily
    ever after”
    “Once upon
    a time…”
    ?
    A view or
    “read model”
    An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

27. @tastapod
    More space than you think you need
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    Someone has
    a puzzle
    or question
    Time
    “They all
    lived happily
    ever after”
    “Once upon
    a time…”
    ?
    A view or
    “read model”
    An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

28. @tastapod
    More space than you think you need
    A domain
    event
    happened
    A command or
    external event
    affects our
    world
    An actor
    Someone has
    a puzzle
    or question
    Time
    “They all
    lived happily
    ever after”
    “Once upon
    a time…”
    ?
    An aggregate or subsystem
    A view or
    “read model”
    An app
    The audience
    understood the
    basic mechanics of
    Event Storming
    

    View Slide

29. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    picked up some
    useful advice
    The audience
    understood
    some of the
    behaviours they
    could expect
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invites
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    W
    hat am
    I
    forgetting?
    

    View Slide

30. @tastapod
    The audience
    learned about
    Event Storming a
    business process
    

    View Slide

31. @tastapod
    The audience
    learned about
    Event Storming a
    business process
    Until finally…
    

    View Slide

32. @tastapod
    The audience
    learned about
    Event Storming a
    business process
    Once upon a
    time…
    Until finally…
    

    View Slide

33. @tastapod
    The audience
    learned about
    Event Storming a
    business process
    Once upon a
    time…
    Until finally…
    

    View Slide

34. @tastapod
    The audience
    learned about
    Event Storming a
    business process
    Once upon a
    time…
    Until finally…
    

    View Slide

35. @tastapod
    The audience
    learned about
    Event Storming a
    business process
    Once upon a
    time…
    Until finally…
    

    View Slide

36. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    picked up some
    useful advice
    The audience
    understood
    some of the
    behaviours they
    could expect
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invites
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    W
    hat am
    I
    forgetting?
    

    View Slide

37. @tastapod
    The audience
    learned about
    Event Storming a
    legacy application
    

    View Slide

38. @tastapod
    The audience
    learned about
    Event Storming a
    legacy application
    

    View Slide

39. @tastapod
    The audience
    learned about
    Event Storming a
    legacy application
    

    View Slide

40. @tastapod
    The audience
    learned about
    Event Storming a
    legacy application
    

    View Slide

41. @tastapod
    The audience
    learned about
    Event Storming a
    legacy application
    

    View Slide

42. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    picked up some
    useful advice
    The audience
    understood
    some of the
    behaviours they
    could expect
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invites
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    W
    hat am
    I
    forgetting?
    

    View Slide

43. @tastapod
    The audience
    learned about
    Event Storming a
    new application
    

    View Slide

44. @tastapod
    Until finally…
    The audience
    learned about
    Event Storming a
    new application
    

    View Slide

45. @tastapod
    Until finally…
    Until finally…
    Until finally…
    The audience
    learned about
    Event Storming a
    new application
    

    View Slide

46. @tastapod
    Once upon a
    time…
    Until finally…
    Until finally…
    Until finally…
    The audience
    learned about
    Event Storming a
    new application
    

    View Slide

47. @tastapod
    Once upon a
    time…
    Until finally…
    Until finally…
    Until finally…
    The audience
    learned about
    Event Storming a
    new application
    

    View Slide

48. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    picked up some
    useful advice
    The audience
    understood
    some of the
    behaviours they
    could expect
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invites
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    W
    hat am
    I
    forgetting?
    

    View Slide

49. @tastapod
    The audience
    picked up some
    useful advice
    

    View Slide

50. @tastapod
    The audience
    picked up some
    useful advice
    Bring lots of
    stationery!
    

    View Slide

51. @tastapod
    The audience
    picked up some
    useful advice
    Bring lots of
    stationery!
    Be prepared
    to break up
    arguments
    

    View Slide

52. @tastapod
    The audience
    picked up some
    useful advice
    Bring lots of
    stationery!
    Be prepared
    to let arguments
    run!
    Be prepared
    to break up
    arguments
    

    View Slide

53. @tastapod
    The audience
    picked up some
    useful advice
    Bring lots of
    stationery!
    Be prepared
    to let arguments
    run!
    Be prepared
    to break up
    arguments
    Be a Time Cop
    

    View Slide

54. @tastapod
    The audience
    picked up some
    useful advice
    Bring lots of
    stationery!
    Be prepared
    to let arguments
    run!
    Be prepared
    to break up
    arguments
    Agree explicit
    ground rules
    Be a Time Cop
    

    View Slide

55. @tastapod
    The audience
    picked up some
    useful advice
    Bring lots of
    stationery!
    Be prepared
    to let arguments
    run!
    Be prepared
    to break up
    arguments
    Agree explicit
    ground rules
    It’s like an
    outboard motor
    Be a Time Cop
    

    View Slide

56. @tastapod
    The audience
    picked up some
    useful advice
    Bring lots of
    stationery!
    Be prepared
    to let arguments
    run!
    Be prepared
    to break up
    arguments
    Agree explicit
    ground rules
    It’s like an
    outboard motor
    Be a Time Cop
    Use a
    Pomodoro
    timer
    

    View Slide

57. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    picked up some
    useful advice
    The audience
    understood
    some of the
    behaviours they
    could expect
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invites
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    W
    hat am
    I
    forgetting?
    

    View Slide

58. @tastapod
    The audience
    understood
    some of the
    behaviours they
    could expect
    

    View Slide

59. @tastapod
    The audience
    understood
    some of the
    behaviours they
    could expect
    The disruptor
    

    View Slide

60. @tastapod
    The audience
    understood
    some of the
    behaviours they
    could expect
    The disruptor
    The know-all
    

    View Slide

61. @tastapod
    The audience
    understood
    some of the
    behaviours they
    could expect
    The disruptor
    The know-all
    The wallflower
    

    View Slide

62. @tastapod
    The audience
    understood
    some of the
    behaviours they
    could expect
    The disruptor
    The know-all
    The wallflower
    The “helper”
    

    View Slide

63. @tastapod
    The audience
    understood
    some of the
    behaviours they
    could expect
    The disruptor
    The know-all
    The wallflower
    The “helper”
    The actual
    helper
    

    View Slide

64. @tastapod
    The audience
    understood
    some of the
    behaviours they
    could expect
    The disruptor
    The know-all
    The wallflower
    The “helper”
    The actual
    helper
    The last word
    

    View Slide

65. @tastapod
    The audience
    understood
    some of the
    behaviours they
    could expect
    The disruptor
    The know-all
    The wallflower
    The “helper”
    The actual
    helper
    The last word
    The surprise
    star
    

    View Slide

66. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    The audience
    learned about
    Event Storming a
    legacy application
    The audience
    learned about
    Event Storming a
    new application
    The audience
    picked up some
    useful advice
    The audience
    understood
    some of the
    behaviours they
    could expect
    The audience
    understood the
    basic mechanics of
    Event Storming
    W
    hat if
    people have
    questions?
    Once upon a time…
    Dan decided to
    explain Event
    Storming
    The audience
    learned about
    Event Storming a
    business process
    Alberto invites
    Dan to speak at
    DDDx 2016
    Alberto
    Dan
    The
    audience
    W
    hat am
    I
    forgetting?
    

    View Slide

67. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    What if
    people have
    questions?
    What am I
    forgetting?
    

    View Slide

68. @tastapod
    Until finally…
    the audience
    could try Event
    Storming
    for fun and profit
    What if
    people have
    questions?
    What am I
    forgetting?
    Thank you!
    

    View Slide