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What is an USECASE? Why it is needed?

Answer Posted / surendra singh (suraj)

It is useful to represent the complete and specific
funtionality that an actor(USER) is desirous of.
This functionality is shown by the USECASE model with the
help of Diagrams, i.e. Sequence Diagram and Colloboration
Diagram. It shows the various states of a work flow(Project
or Program).

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