In software and systems engineering, a use case (pronounced /juːs/, a case in the use of a system) is a list of steps, typically defining interactions between a role (known in UML as an "actor") and a system, to achieve a goal. The actor can be a human or an external system.
In systems engineering, use cases are used at a higher level than within software engineering, often representing missions or stakeholder goals. The detailed requirements may then be captured in SysML or as contractual statements.
Read more about Use Case: History, Actors, Use Case Notation, Limitations
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“If a playwright tried to see eye to eye with everybody, he would get the worst case of strabismus since Hannibal lost an eye trying to count his nineteen elephants during a snowstorm while crossing the Alps.”
—James Thurber (1894–1961)