UML Designer User's Guide


Identifying actors

The action of the Adding a book use case is initiated by a librarian, a human user. This is a person who actually enters the information for a new book and initiates the cataloging operation. Because the librarian exists outside the system and provides the stimulus setting the use case in motion, the librarian is an actor. We can now create an Actor element in the Library Catalog model to represent the librarian.


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