About UML use case diagrams

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After you identify the use cases, you can create use case diagrams to put the use cases in context. Creating a use case diagram involves establishing a system boundary for a set of use cases and defining the lines of communication between a particular actor and a use case.

In the early stages of a development project, use case diagrams describe real-world activities and motivations. You can refine the diagrams in later stages to reflect user interface and design details.

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