Mke agile 032014 Slicing the cake: User Story Decomposition
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This document discusses strategies for decomposing large user stories into smaller stories that can be developed independently. It outlines 8 strategies for "vertical slicing" a user story, including breaking it down by workflow steps, business rules, happy and unhappy flows, input options, data types and parameters, operations, test cases and acceptance criteria, and roles. The strategies are then illustrated with 3 examples. Vertical slicing breaks a story down across the layers of a system, rather than developing each layer separately in a "horizontal slice". This vertical decomposition allows stories to be estimated and developed independently.
![What is a User Story?
Feature
Desired interaction between user and system
Invitation to have a conversation
Written by product owner
Collaboration
Independent
Negotiable
Valuable
Estimatable
Small
Testable
As a [user role]
I want to [goal]
so I can [reason]
Not a requirement Not a use case
Vertical slice through a system](https://image.slidesharecdn.com/mkeagile032014-slicingthecakeuserstorydecomposition-140312084503-phpapp02/85/Mke-agile-032014-Slicing-the-cake-User-Story-Decomposition-3-320.jpg)
Mke agile 032014 Slicing the cake: User Story Decomposition
- 1. Slicing the Cake Strategies for User Story Decomposition Milwaukee Agile Meetup March 11, 2014 Dave Neuman
- 2. What is a User Story?
- 3. What is a User Story? Feature Desired interaction between user and system Invitation to have a conversation Written by product owner Collaboration Independent Negotiable Valuable Estimatable Small Testable As a [user role] I want to [goal] so I can [reason] Not a requirement Not a use case Vertical slice through a system
- 4. Vertical Slices over Horizontal Slices Web UI Middleware Data Layer
- 6. 8 Strategies for Vertical Slicing 1. Workflow steps?! ! What steps does a user perform? Are all steps necessary (right now)? Can steps be simplified (for now)? ! Ex: steps in an order process, like selecting a payment option, delivery method, etc 2. Business rules?! ! What rules apply to this story? Are all business rules necessary (right now)? Can simpler rules suffice (for now)? ! Ex: payment methods allowed during the purchase process 3. Happy/unhappy flows?! ! What does the happy/unhappy flow look like? Are all unhappy flows necessary (right now)? Can unhappy flows be simplified (for now)? ! Ex: failures during web shopping order process and possible recovery options 4. Input options?! ! Which platforms are supported? Are all platforms necessary (right now)? Are some platforms harder than others? ! Ex: web, tablet, iPhone, iPad, Android christiaanverwijs.nl but there could be more…
- 7. 8 Strategies for Vertical Slicing 5. Data types & parameters?! ! What data types are supported? Are all data types necessary (right now)? What parameters are relevant (for now)? ! Ex: different search options / strategies or different kinds of reports (tables, graphs, etc.) 6. Operations?! ! What operations does the story entail? Are all operations necessary (right now)? Can any operations be simplified (for now)? ! Ex: splitting on CRUD (create, read, update, delete) 7. Test cases / acceptance criteria?! ! What tests are used to verify this story? What acceptance criteria apply? Are all test scenarios necessary (for now)? ! Ex: some test scenarios may be very complex, test scenarios cover different functional requirements 8. Roles?! ! What roles are involved in this story? Are all roles necessary (right now)? ! ! Ex: customers can create orders, administrators can manage orders, etc. christiaanverwijs.nl but there could be more…
- 9. Workflow steps? Business rules? Happy / unhappy flows? Input options? Data types & parameters? Operations? Test cases / acceptance criteria? Roles? Example #1
- 10. ERP! Workorders, Financials, T&E Field Equipment Data Collection System Field Service Report Example #2 Page 1 Page 5 Workflow steps? Business rules? Happy / unhappy flows? Input options? Data types & parameters? Operations? Test cases / acceptance criteria? Roles?
- 11. Example #3 Workflow steps? Business rules? Happy / unhappy flows? Input options? Data types & parameters? Operations? Test cases / acceptance criteria? Roles?