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Executable UML: A Foundation for Model-Driven Architecture by Marc J. Balcer, Stephen J. Mellor

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4.1. Basics of Use Cases

Systems respond to external signals by carrying out some desired activity, often with varying outcomes depending upon the system's state. Each desired activity is a functional requirement, such as:

  • A customer can order a book by selecting a book number and quantity.

  • A customer checks out an open order by entering the credit card number and shipping information.

  • The credit card company approves or declines a charge.

  • If the customer's credit card charge is approved, the requested items are packed and shipped to the customer.

Use cases are a tool for organizing system requirements by understanding the interactions between the actors that make a request and the responses, or activities, made by the system. (These terms were ...

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