Is it necessary to include the login for every usecase?

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In most cases, it will only clutter up your diagrams. Login is neither complex (*) nor does it give you much added value as a use case. In your textual document that includes the use cases with description, include as a prerequisite a list of features that require a successful login. Easier to track and to test.

(*) In regards to the expected outcome from the user’s perspective. Login could be of an arbitrary technical complexity but that is irrelevant for the use case diagram.

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