Include and Extend Use Case Diagram

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How to use extend and include use cases in UML?

Include : An include relationship defines that a use case contains behaviors defined in another use case. In other words, the base case explicitly incorporates the behavior of another use case at a location specified in the base use case.

Extend: A relationship from a base use case to an extended use case that specifies how and when the behavior defined in the base use case can be inserted into the behavior defined in the extended use case. In other words, the extended use case adds itself to the base use case. Most of the time, an extend relationship has a condition attached to it. The extended use case executes only when the condition is true.

Include vs Extend Use Cases

  • Include Use Case - The include use case never stand alone. When an actor initiates any base use case then base use case executes included use case.

  • Extend Use Case - The base use case may stand alone, but under certain conditions, its behavior may be extended by behavior of another use case.


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