A use case is a description of a system’s behavior as it responds to a request that originates from outside of that system. The use case technique is used in software and systems engineering to capture the functional requirements of a system. A use case involves a primary actor and a system. Use cases describe the interaction between these two things. An actor is something or someone which exists outside the system under study, and that takes part in a sequence of activities in a dialogue with the system, to achieve some goal. A use case should describe how the system should be used by the actor to achieve a particular goal, include no implementation-specific language, be at the appropriate level of detail, and should not include detail regarding user interfaces and screens. Without a goal a use case is useless.
There are three degrees of detail when writing a use case. First there is a brief use case which consists of a few sentences summarizing the use case. Next is a......
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