Use cases can also have extend relationships, which indicate that one use case adds optional or exceptional behavior to another use case under certain conditions.An include relationship can be used to reuse common functionality, simplify complex use cases, or abstract low-level details.An include relationship is represented by a dashed arrow with the stereotype «include» from the base to the inclusion.An include relationship is a dependency between two use cases, where one use case (the base) incorporates the behavior of another use case (the inclusion) as part of its normal execution.For example, a Login use case can be included by many other use cases that require authentication. Use cases can have include relationships, which indicate that one use case incorporates the behavior of another use case as part of its normal execution.Relationships Between Actors and Use Cases: For example, an Instructor actor can be associated with a Grade Assignment use case. Actors can also have association relationships, which indicate that an actor is involved in a use case.For example, a Student actor can be a generalization of an Undergraduate Student actor and a Graduate Student actor. Actors are represented by stick figures in a Use Case diagram.Īctors can have generalization relationships, which indicate that one actor inherits the characteristics and behaviors of another actor.A scenario is a sequence of steps that describe what happens in a specific situation1. A use case is a set of scenarios that describe how the system and the actor collaborate to achieve a common goal1. ![]() An actor can be a person, another system, or a time event.
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