Chapter 5. Use Case Diagrams

Specifying system use cases is a common design activity for systems engineering teams. The SysML use case diagram supports this activity. Use case diagrams let you display various kinds of elements and relationships to express information about the services your system provides and the stakeholders who require those services.

5.1. Purpose

A use case diagram concisely conveys a set of use cases—the externally visible services that a system provides—as well as the actors that invoke and participate in those use cases. A use case diagram is a black-box view of the system; it is therefore well suited to serve as a system context diagram.

5.2. When Should You Create a Use Case Diagram?

A use case diagram is an analysis ...

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