[ENG] How Domain Storytelling Shaped our View of Bounded Contexts

Presented at Explore DDD 2018.

Domain Storytelling means that we bring together domain experts and developers. We let them tell us stories about their domain. While listening, we record the stories using a pictographic language. The experts can see immediately if 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.

Henning and Stefan will demonstrate Domain Storytelling by re-enacting how they modeled ship maneuver planning in the port of Hamburg. You will see that Domain Stories show how people work together within and across contexts – and how unsuitable boundaries prevent people from working together. After all, bounded contexts should separate models, not people.

Transcript

1. How 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. shaped our view of Bounded Contexts
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3. @hofstef @hschwentner An additional tool for your modeling toolbox
4. @hofstef @hschwentner Change your view on context boundaries
5. @hofstef @hschwentner Domain Knowledge
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8. @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
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13. @hofstef @hschwentner Hafengeburtstag Hamburg CC-by Wir.dienen.Deutschland (Bundeswehr), flickr.com
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15. @hofstef @hschwentner Rio Bravo CC-By Dan Davison flickr.com
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17. @hofstef @hschwentner Hamburg_Lotsenhaus_Seemannshoeft , CC-By Thorsten Bätge, wikimedia.org
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19. @hofstef @hschwentner DEPTH
20. @hofstef @hschwentner Peilschiff "Deepenschriewer II" im Hamburger Hafen CC-BY-SA Afrank99, wikimedia.org
21. @hofstef @hschwentner Picture: Henning Schwentner
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24. @hofstef @hschwentner Is there an app for that?
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28. @hofstef @hschwentner Navigating Officer Captain route puts 1 2 ship shilhouette depth map on Cartographer MANEUVER PLANNING (BIG PICTURE)
29. @hofstef @hschwentner Navigating Officer Captain route puts 1 2 ship shilhouette depth map on Cartographer MANEUVER PLANNING (BIG PICTURE)
30. @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
31. @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
32. @hofstef @hschwentner Domain Storytelling Explained @hofstef @hschwentner
33. @hofstef @hschwentner actor work object activity annotation
34. @hofstef @hschwentner cartographer depth map draws
35. @hofstef @hschwentner person people system
36. @hofstef @hschwentner …asks for route …finds route route route asks for finds
37. @hofstef @hschwentner The Navigating Officer discusses the route with the Captain. discusses route Captain Navigating Officer with
38. @hofstef @hschwentner Cartographer depth measures 1 depth (raw) sends 2 to Sounding Ship
39. @hofstef @hschwentner 3 good examples are better than 1 bad abstraction
40. @hofstef @hschwentner &
41. @hofstef @hschwentner Strategic Design Ubiquitous Language Tactical Design
42. @hofstef @hschwentner Strategic Design Ubiquitous Language Tactical Design
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45. @hofstef @hschwentner activities shape bounded contexts
46. @hofstef @hschwentner moves & turns Navigating Officer ship shilhouette
47. @hofstef @hschwentner moves & turns Navigating Officer ship shilhouette Captain route discusses with
48. @hofstef @hschwentner moves & turns Navigating Officer ship shilhouette Captain route discusses with sends depth map Cartographer
49. @hofstef @hschwentner activities shape bounded contexts
50. @hofstef @hschwentner activities that belong together shape bounded contexts
51. @hofstef @hschwentner activities that belong together from a domain expert’s perspective shape bounded contexts
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 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
54. @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 ?
55. @hofstef @hschwentner bounded context: activities that, from an actor’s perspective, belong together
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59. 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