In 1987, Ivar Jacobson presented the first article on use cases at the OOPSLA'87 conference. The detailed requirements may then be captured in the Systems Modeling Language (SysML) or as contractual statements. In systems engineering, use cases are used at a higher level than within software engineering, often representing missions or stakeholder goals. The actor can be a human or another external system. A potential scenario in which a system receives an external request (such as user input) and responds to it.Ī use case is a list of actions or event steps typically defining the interactions between a role (known in the Unified Modeling Language (UML) as an actor) and a system to achieve a goal.A usage scenario for a piece of software often used in the plural to suggest situations where a piece of software may be useful.In software and systems engineering, the phrase use case is a polyseme with two senses:
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