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A use case is made up of a set of possible sequences of interactions between the application and users in a particular environment and related to a particular goal.
Specifically, a use case is a single task, performed by the end user of a system that has some useful outcome.
These documents can be used to design a system and develop custom software, or alternatively as the evaluation framework for selection of a compatible off-the-shelf product.
These use cases were used to develop specific requirements which are used in the Decision Model Tool. In order to know what application will best meet your needs, it is necessary to first specify the requirements for the application.
One commonly accepted way to document these requirements is the Use Case approach.