Use Cases 和 User Story 不同之處
Use cases - User Stories: so precious but not the same !
http://www.agile-ux.com/2009/01/23/use-cases-user-stories-so-precious-but-not-the-same/
以前在做object oriented/UML 時, 談的都是user cases, 現在在做agile時, 開始改談user story.
可是一開始覺得user story的描述和user case很像, 只是user story長了一點. 然後user story也不會像user case一樣要寫, scenario, pre-condition, post-condition...等等.
總覺得兩者, 說像不像, 總是同中有異.
在網路上找到有人比較兩者之間的差異, 讓我們一起來看看有什麼不同:
1. A user story is a brief description of functionality as viewed by the user (Role → Goal).
- It doesn’t model the interaction between the actor and the system, what the use case does.
- A user story is not a sequence of actions.
2. A user story is short and consist in one or two sentences written in the language of the user
- Example: As a recruiter, I can submit job vacancies. A role and a goal, then it is discussed.
- A use case is heavier, richer in information: goal, summary, actor, precondition, trigger event, main success scenario and extensions (alternative paths, errors …). Use case is (too much) detailed.
3. A user story is smaller and can finally be seen as a part of a specific use case: the main success scenario or an extension
4. User stories are used for planning.
- They play a major role in project estimation and planning (via story points and velocity).
- Use cases are not used for planning, even if you can use “use cases points” technique to estimate project size.
5. User stories emerge faster than use cases; use cases require more time for analysis and writing
6. User stories are more readable than use cases
- Use cases usually belong to a large word document, often poorly written and difficult to read even in a structured template
7. User stories are easier to maintain than a 150 pages Use cases Document
8. User stories are based on verbal communication and rely on collaboration, discussion and proximity to clarify details
- Use case is a textual model (associated with diagrams): every thing is written !
9. User stories are in theory written on cards
- Remember the 3 C rule: Card, Conversation, Confirmation
- They’re not intended to be archived unlike use cases.
10. A user story must be implemented and tested in one iteration
- A specific use case can be implemented in several iterations: main success scenarion on iteration 1; extensions in Iteration 2 and 3 …
11. User stories can be more easily written by a user or customer
- Most of the time use cases are written by user proxies (BA, Consultants …)
12. User stories contain acceptance tests (validation criteria) written on the back of the story card; use case not: tests cases are created in a separate documentation
13. Use cases provide a more holistic view of the system: precondition, UC diagram, sub use case. Linking user stories is less obvious. This is also a reason why UX and IxD activities are so important in agile contexts !
14. Finally, Use cases and user stories are usually associated with two different methodologies (Unified Process vs eXtreme Programming).
- But you can do user stories in a Unified Process environment !
作者雖然已經有十年使用use case經驗, 但是現在他覺得user story是他的最愛, 原因呢?
* User stories focus on what is really important
* User stories are more appropriate for collaboration
* User stories can perfectly be combined with UX(User eXperience) activities (Personas, Storyboard, Wireframes):
User stories + UX artifacts = Just enough
看起來user story是比use case, 更有效率想要找出user真正的需求, 更著重有效溝通. 不知各位看倌你們的感覺如何?
Use cases - User Stories: so precious but not the same !
http://www.agile-ux.com/2009/01/23/use-cases-user-stories-so-precious-but-not-the-same/
以前在做object oriented/UML 時, 談的都是user cases, 現在在做agile時, 開始改談user story.
可是一開始覺得user story的描述和user case很像, 只是user story長了一點. 然後user story也不會像user case一樣要寫, scenario, pre-condition, post-condition...等等.
總覺得兩者, 說像不像, 總是同中有異.
在網路上找到有人比較兩者之間的差異, 讓我們一起來看看有什麼不同:
1. A user story is a brief description of functionality as viewed by the user (Role → Goal).
- It doesn’t model the interaction between the actor and the system, what the use case does.
- A user story is not a sequence of actions.
2. A user story is short and consist in one or two sentences written in the language of the user
- Example: As a recruiter, I can submit job vacancies. A role and a goal, then it is discussed.
- A use case is heavier, richer in information: goal, summary, actor, precondition, trigger event, main success scenario and extensions (alternative paths, errors …). Use case is (too much) detailed.
3. A user story is smaller and can finally be seen as a part of a specific use case: the main success scenario or an extension
4. User stories are used for planning.
- They play a major role in project estimation and planning (via story points and velocity).
- Use cases are not used for planning, even if you can use “use cases points” technique to estimate project size.
5. User stories emerge faster than use cases; use cases require more time for analysis and writing
6. User stories are more readable than use cases
- Use cases usually belong to a large word document, often poorly written and difficult to read even in a structured template
7. User stories are easier to maintain than a 150 pages Use cases Document
8. User stories are based on verbal communication and rely on collaboration, discussion and proximity to clarify details
- Use case is a textual model (associated with diagrams): every thing is written !
9. User stories are in theory written on cards
- Remember the 3 C rule: Card, Conversation, Confirmation
- They’re not intended to be archived unlike use cases.
10. A user story must be implemented and tested in one iteration
- A specific use case can be implemented in several iterations: main success scenarion on iteration 1; extensions in Iteration 2 and 3 …
11. User stories can be more easily written by a user or customer
- Most of the time use cases are written by user proxies (BA, Consultants …)
12. User stories contain acceptance tests (validation criteria) written on the back of the story card; use case not: tests cases are created in a separate documentation
13. Use cases provide a more holistic view of the system: precondition, UC diagram, sub use case. Linking user stories is less obvious. This is also a reason why UX and IxD activities are so important in agile contexts !
14. Finally, Use cases and user stories are usually associated with two different methodologies (Unified Process vs eXtreme Programming).
- But you can do user stories in a Unified Process environment !
作者雖然已經有十年使用use case經驗, 但是現在他覺得user story是他的最愛, 原因呢?
* User stories focus on what is really important
* User stories are more appropriate for collaboration
* User stories can perfectly be combined with UX(User eXperience) activities (Personas, Storyboard, Wireframes):
User stories + UX artifacts = Just enough
看起來user story是比use case, 更有效率想要找出user真正的需求, 更著重有效溝通. 不知各位看倌你們的感覺如何?
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