They contain just the essential information that helps outline the following: represent the goals of system-user interactions, define and organize the functional requirements in a system, specify the context and requirements of a system, and model the basic flow of events in a use case. Generally, use case diagrams are not very detailed. It’s a powerful tool for communicating your desired system behavior in the language of the user, by specifying all externally visible system behavior. A use case diagram is helpful because it allows you to design a system from the perspective of the end user. It typically depicts the expected behavior of the system: what will happen and when. This powerful visual framework helps your team quickly illustrate system functionality. A use case diagram is a visual tool that helps you analyze the relationships between personas and use cases.
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