Breaking down CRUD In Use Case Modeling

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I have a follow up question from CRUD in a use-case diagram?

If i am required to break down complex use case such as "Manage User" (Let's assume this is complex), would it be alright to extend them into different cases? Or should i use include?

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qwerty_so On BEST ANSWER

This is fine. <<extend>> means that the extending UC is optional.

As a side note: avoid <<extend>> and <<include>> since they are a sign of functional decomposition. And that's not what you are supposed to do with use case synthesis. CRUD however is a borderline case. So, this should be fine.