Building Better Domain Models With Jeff Patton's User Story Mapping

A small workshop by Daniel Sack and Martin Schimak, DDD Vienna, April 5th 2019

Transcript

1. Building Better Domain Models with Jeff Patton’s User Story Mapping A small workshop by Daniel Sack and Martin Schimak, DDD Vienna, April 5th 2019
2. User Story Mapping and Domain Modeling https://specmap.cc/ https://martinfowler.com/bliki/BoundedContext.html
3. Get ready for work Wake up Discrete Steps are the smaller things we do. They help us to reach the goal of activities. Activities are bigger things we do. They are comprised of multiple steps. Configure alarm sound Looking at Details we may see different means, options and alternatives how to carry out steps. The main ingredients of user story mapping …
4. Wake up Get ready for work Get ready to leave the house Have a breakfast Commute to the workplace Get settled in and start work Configure alarm sound Get out of bed Brew and drink coffee Walk to station and take subway Have a morning chat Hit snooze button Add some milk and sugar Choose the best train Hugo, a world class gardener: „Walking Skeleton“ „Backbone“ (activities) Start with gardening
5. Configure alarm sound Get out of bed Brew and drink coffee Walk to station and take subway Have a morning chat Hit snooze button Clean up for the day Add some milk and sugar Choose the best train Start with gardening Mapped Backlog User journey Priority Read map from left to right, from top to bottom Pull 1 Pull 2 Pull 2 Pull 3 Pull 3 Project good enough! ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
6. Work with what fits best for your team and don’t be afraid to change! © https://mozaicworks.com/blog/3-uses-story-maps-build-better-product/
7. Is this „just“ plain old „agile“ methodology?
8. What about DDD?
9. © Paul Rayner‘s „Essential DDD“ workshop in Denver 2018 `s three pillars
10. DDD - developing great business software - is a lot about … collaborative modeling
11. Ubiquituos language … … encompasses all three pillars of DDD!
12. These are BEDs in the context of gardening work
13. These are (track) BEDs in the context of subway transport
14. This is a BED (and a snoring gardener) in a domestic context
15. It is NOT universal ... and NOT even „enterprise-wide“! :-) Ubiquitous Language?
16. But if not universal … what does ubiquitous actually mean?
17. Configure alarm sound Get out of bed Brew and drink coffee Walk to station and take subway Have a morning chat Hit snooze button Clean up for the day Add some milk and sugar Choose the best line Start with gardening It‘s ubiquitous for a DDD team. Language matters. Wake up Get ready to leave the house Commute to the office Get settled in and start work Have a breakfast
18. Language needs context
19. Configure alarm sound Get out of bed Brew and drink coffee Walk to station and take subway Have a morning chat Hit snooze button Clean up for the day Add some milk and sugar Choose the best line Start with work User story maps provide a good dose of context … Wake up Get ready to leave the house Commute to the work place Get settled in and start work Have a breakfast We know what this is!
20. Activites and Steps help us remember and re- tell the story, they focus on giving us context. Configure alarm sound The Detail Stories help us to imagine the product we build, and describe the software we could build. … and are telling us a bigger story (user journey) Get ready for work Wake up
21. Configure alarm sound Get out of bed Brew and drink coffee Walk to station and take subway Have a morning chat Hit snooze button Clean up for the day Add some milk and sugar Choose the best line Start with work The more context we know, the better we see boundaries Wake up Get ready to leave the house Commute to the work place Get settled in and start work Have a breakfast
22. Language needs Context Models need Boundaries
23. © Paul Rayner‘s „Essential DDD“ workshop in Denver 2018 `s three pillars
24. Useful models need a purpose. And precise language!
25. Gardening Work Product Price Supplier Subway Transport Line Track Station Alarm Snooze Wake up Domestic/Household The idea of explicitely defining bounded contexts. Ubiquitous Language Ubiquitous Language Ubiquitous Language Bounded Context Bounded Context Bounded Context
26. Story maps let us see through to bounded contexts Interpretation
27. © Paul Rayner‘s „Essential DDD“ workshop in Denver 2018 `s three pillars
28. Account Management Identifying a core domain … depends on priorities Credit Transfer Customer Relationship Gardening work Domestic/Household Supporting Domain Core Domain Generic Domain Subway Transport
29. Configure alarm sound Get out of bed Brew and drink coffee Walk to station and take subway Have a morning chat Hit snooze button Clean up for the day Add some milk and sugar Choose the best train Start with gardening Mapped Backlog User journey Priority There is at least a soft relationship to story maps … Pull 1 Pull 2 Pull 2 Pull 3 Pull 3 Project good enough!
30. Understanding bounded contexts will help planning Get ready for work Wake up Configure alarm sound Huge epic spanning several contexts Large feature spanning several stories Small story ready for implementation
31. Story maps and context maps must „live“ (or die) Interpretation Learning
32. Strategic Design is key: Models and Teams need explicit boundaries
37. Hands-on!
38. Coffee lover Hugo starts his small Coffee Roasting Biz! *) *) Inspired by Nick Chamberlain‘s book „Applying Domain-Driven Design with CQRS and Eventsourcing“ Thank you, Nick!
39. Hugo says: “We roast-to-order your very own coffee!“ Do you, Hugo? Well, almost. What actually happens … 1) Hugo buys diverse green beans and stocks them 2) Hugo schedules roasting days - to roast the beans in batches 3) Customers buy coffee on website – coffee roasted in a very specific batch!
40. Now it‘s our turn to build a story map – PHASE 1 1) You get an unsorted starter set of stickies! 2) Try to make sense of the pink skeleton! 3) Add yellow stickies and prioritize them, rewrite, add, dismiss!
41. Now it‘s our turn to build a story map – PHASE 2 1) Step back and watch out for semantical boundaries 2) Use sticky notes to name some bounded context candidates 3) Discuss some deliverables: how are they related to contexts? Use colored dots to show a relation! Domestic, Household