[ENG] Finding Context Boundaries with Domain Storytelling @ DDD Europe

DDD practitioners want to identify bounded contexts and work out ubiquitous languages. Domain experts, however, often work together across contexts. The boundaries that shape our software systems must therefore not become borders that prevent people from working together. Domain Storytelling helps us to see how bounded contexts are connected. Domain Storytelling means that we bring together domain experts and developers. We let them tell us stories about their collaborative tasks. While listening, we record the stories using a pictographic language. The experts can see immediately whether or not we understand their story. After very few stories, we are able to talk about the people, tasks, tools, work items, and events in that domain. The visualized stories give us clues for finding context boundaries. As we learn more about a domain and refine our ubiquitous languages, we will adapt the context boundaries.

Transcript

1. Finding Context Boundaries with Brought to you by Stefan (@hofstef) and Henning (@hschwentner). We are two DDD Enthusiasts working at WPS – Workplace Solutions GmbH in the beautiful city of Hamburg.
2. @hofstef @hschwentner
3. @hofstef @hschwentner An additional tool for your modeling toolbox
4. @hofstef @hschwentner A model of how people work together
5. @hofstef @hschwentner Change your view on context boundaries
6. @hofstef @hschwentner Domain Knowledge
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9. @hofstef @hschwentner Le skyline de Shanghai, le jour CC-BY-SA Simon Desmarais, https://www.flickr.com/photos/simonippon/15572217514/ Blick auf die Frontseite der Elbphilharmonie CC-BY-SA Avda, https://de.wikipedia.org/wiki/Datei:Hamburg_- _Elbphilharmonie_-_2016.jpg
10. @hofstef @hschwentner Elbmünmdung CC-BY-SA Robert Gloth, https://de.wikipedia.org/wiki/Datei:Elbm%C3%BCndung,Elbmuendung.jpg
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13. @hofstef @hschwentner Hafengeburtstag Hamburg CC-by Wir.dienen.Deutschland (Bundeswehr), flickr.com
14. @hofstef @hschwentner Rio Bravo CC-By Dan Davison flickr.com
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16. @hofstef @hschwentner Hamburg_Lotsenhaus_Seemannshoeft , CC-By Thorsten Bätge, wikimedia.org
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19. @hofstef @hschwentner Peilschiff "Deepenschriewer II" im Hamburger Hafen CC-BY-SA Afrank99, wikimedia.org
20. @hofstef @hschwentner Picture: Henning Schwentner
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23. @hofstef @hschwentner Is there an app for that?
24. @hofstef @hschwentner © WPS - Workplace Solutions GmbH
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26. @hofstef @hschwentner Navigating Officer Captain route puts 1 2 ship shilhouette depth map on Cartographer MANEUVER PLANNING (BIG PICTURE)
27. @hofstef @hschwentner Navigating Officer Captain route puts 1 2 ship shilhouette depth map on Cartographer MANEUVER PLANNING (BIG PICTURE)
28. @hofstef @hschwentner Navigating Officer Captain route puts ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map MANEUVER PLANNING (BIG PICTURE) (1-5) daily
29. @hofstef @hschwentner puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available
30. @hofstef @hschwentner Domain Storytelling Explained @hofstef @hschwentner
31. @hofstef @hschwentner actor work object activity annotation
32. @hofstef @hschwentner cartographer depth map draws
33. @hofstef @hschwentner person group IT system
34. @hofstef @hschwentner …asks for route …finds route route route asks for finds
35. @hofstef @hschwentner The Navigating Officer discusses the route with the Captain. discusses route Captain Navigating Officer with
36. @hofstef @hschwentner Cartographer depth measures 1 depth (raw) sends 2 to Sounding Ship
37. @hofstef @hschwentner 3 good examples are better than 1 bad abstraction.
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40. @hofstef @hschwentner Bundesarchiv, Bild 173-1282 / Helmut J. Wolf / CC-BY-SA 3.0
41. @hofstef @hschwentner puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available
42. @hofstef @hschwentner puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available CARTOGRAPHY
43. @hofstef @hschwentner puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available
44. @hofstef @hschwentner Indicators: 1) one-way information flow CARTOGRAPHY
45. @hofstef @hschwentner puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available
46. @hofstef @hschwentner Ship
47. @hofstef @hschwentner Indicators: 1) one-way information flow 2) difference in language CARTOGRAPHY
48. @hofstef @hschwentner puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available
49. @hofstef @hschwentner puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available
50. @hofstef @hschwentner Indicators: 1) one-way information flow 2) difference in language 3) different triggers (time vs. on demand) CARTOGRAPHY
51. @hofstef @hschwentner puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available ?
52. @hofstef @hschwentner puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available
53. @hofstef @hschwentner
54. Stefan: sh@wps.de @hofstef speakerdeck.com/hofstef http://domainstorytelling.org The pictures used in this talk are public domain, unless noted otherwise. Screenshots and examples © WPS - Workplace Solutions GmbH Henning: hs@wps.de @hschwentner speakerdeck.com/hschwentner