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Actors
A Use Case is a sequence of transactions performed by a system that produces a measurable result for a particular actor. A Use Case describes the interaction between users and a system that is to solve a business problem. A Use Case describes what a user does with a system to produce a business event that forms part of a business process. They represent the functions that are made available by the system to the actor.
An example Use Case that could be performed by an Actor
Verb as the first word.
You will note that a good use case is a grouping of related flows of events. A use case will begin with a verb and will provide a meaningful and identifiable value to an actor. Once actors have been discovered,use cases are found by looking for tasks that the actor would perform with the system. Areas to look out for are where does the system or actor exchange information. It is also necessary to check whether all the desired features have been covered in the use cases.
