Chapter 18
Use Case Diagrams
Activity diagrams are discussed in Chapter 20; state diagrams are discussed in Chapter 25; sequence and communication diagrams are discussed in Chapter 19.
Use case diagrams are one of the diagrams in the UML for modeling the dynamic aspects of systems. (Activity diagrams, state diagrams, sequence diagrams, and communication diagrams are four other kinds of diagrams in the UML for modeling the dynamic aspects of systems.) Use case diagrams are central to modeling the behavior of a system, a subsystem, or a class. Each one shows a set of use cases and actors and their relationships.
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