Simplifying Use Cases - Extend - The <<Extend>> Notation

3 important questions on Simplifying Use Cases - Extend - The <<Extend>> Notation

How do we draw an extension?

An extension Use Case is drawn as a Use Case oval, with a dashed arrow line from the extension to the Base.

On the dashed line, place the «extend».

This is the opposite direction from that of the «include».

What is alsopossible with an extension use case? Name 3 things.

  • An extension Use Case can «include» other Use Cases and can have «extends» of its own.

  • The same extending Use Case can extend more than one Use Case.

  • Furthermore, an extending Use Case may itself be extended

How did we call the <<extend>> notation in earlier versions of UML?


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