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Relationships in use case.

Relationships in use case:


There are five types of relationships:

  • Association between Actor and Use case: An actor must be associated with at least one use case.


  • Generalization of an Actor: One actor can inherit the role of another actor. The descendant inherits all the use cases of the ancestor.


  • Generalization of a Use case: This is used when there are common behavior between two use cases and also specialized behavior specific to each use case.


  • Include between two Use cases: The base use case is incomplete without the included use case. The included use case is mandatory and not optional.


  • Extend between two Use cases: The extending use case is usually optional. It should be independent.


Use case Relationships

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