Basic Use Case Diagram Symbols and Notations
Draw your system’s boundaries using a rectangle that contains use cases. Place actors outside the system’s boundaries.
System symbol - use case diagramUse Case
Draw use cases using ovals. Label the ovals with verbs that represent the system’s functions.
Use case symbol - use case diagramActors
Actors are the users of a system. When one system is the actor of another system, label the actor system with the actor stereotype.
Actor symbol - use case diagramRelationships
Illustrate relationships between an actor and a use case with a simple line. For relationships among use cases, use arrows labeled either “uses” or “extends.” A “uses” relationship indicates that one use case is needed by another in order to perform a task. An “extends” relationship indicates alternative options under a certain use case.
Relationship symbol - use case diagram

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