Why do use cases? A use case is a formalized story that describes how someone or something procedurally interacts with an existing or proposed system. Basically it is a list of steps, typically defining interactions between a role (actor) and a system, to achieve a goal. The actor can be a human or an external system. Use cases provide the requirements, development, and testing phases a guidebook to describe complex systems and processes in an easy to understand way. They help document, categorize and prioritize requirements as well as validate stakeholders at various levels.
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