Use Cases

Use cases model a dialogue between an actor and the system. They represent the functionality provided by the system; that is, what capabilities will be provided to an actor by the system. The collection of use cases for a system constitute all the defined ways the system may be used. The formal definition for a use case is: A use case is a sequence of transactions performed by a system that yields a measurable result of values for a particular actor.

The following questions may be used to help identify the use cases for a system:

  • What are the tasks of each actor?

  • Will any actor create, store, change, remove, or read information in the system?

  • What use case will create, store, change, remove, or read this information?

  • Will any actor need ...

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