31-10-2016, 12:03 PM
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Use case diagram shows a set of use case and actor(a specific kind of class)and their relationships usecase diagrams address the static use case view of a system.These diagrams are especially important in organizing and modelling the behavior a system.
The purpose of use case diagram is to capture the dynamic aspect of a system. But this definition is too generic to describe the purpose.
Use case diagram are considered for high level requirement analysis of a system. So when the requirements of a system are analyzed the functionalities are capture in use cases. So we can say that uses cases are nothing but the system functionalities written in an organized manner.