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Behavioral UML diagrams. A use case diagram at its simplest is a representation of a user's interaction with the system that shows the relationship between the user and the different use cases in which the user is involved.
Use-case model is widely used in requirements gathering and is very popular. In fact the use-case model is the result of the requirements discipline. Requirements gathering utilizes this model from Identified to Agreed upon and it also works out the domain model which defines the terminology used by the use cases.