INTERCHANGE 2 LISTENING TEXT PDF
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In software and systems engineering , a 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. The actor can be a human or other external system. In systems engineering, use cases are used at a higher level than within software engineering , often representing missions or stakeholder goals. Use case analysis is an important and valuable requirement analysis technique that has been widely used in modern software engineering since its formal introduction by Ivar Jacobson in With its inherent iterative, incremental and evolutionary nature, use case also fits well for agile development.