Use cases are a technique for capturing functional requirements of a systems. They descrive the typical interactions between users of the system and the system itself.
A scenario is a series of steps describing an interaction between the user and the system
A use case is a set of scenarios tied together by a common user goal
In the early stage of development, use cases help capture requirements and determine specifications
In the later stages of development, use case help in design and implementation by determining goal that will meet these specifications
In reveiw and testing, use cases can be used to drive system behaviour for examination.
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