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Diagram

What the digram shows is a user:

  1. Submits an inquiry into the system.
  2. The user can amend their enquiry
  3. If the user finds a counter-party, they can then negotiate which results in a trade execution.
  4. This then results in a private auction between the two counter-parties.
  5. The private negotiation then extends to a public auction.

The problem I am having is understanding the difference between includes and extends. Can someone please clarify which use cases include or extend to the other use case?

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1 Answers1

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You find a lot of questions on SO about how to distinguish include and extend. See here: extends vs include in usecase

Please note that you should use verbs instead of nouns as use case names. Also, you have drawn a generalization between actor and use case. This is semantically wrong, it should be a plain line, not an arrow.

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