Should you write a primary scenario for every use case in a use case diagram separately or write one primary scenario that incorporates all the use cases in the diagram?

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I'm not sure what your definitions are, but I'm pretty sure the convention is this:

  • Use case diagram - a diagram associating actors to use cases.
  • Use case - a set of actions, including variants (ie, the primary and alternative paths).
  • Scenario - a specific sequence of action (ie, a single path - primary or not).

So by these definitions, you should write a (primary) scenario for each use case.

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