A use case is a procedure by which an actor may use the system. It:

	Is a collection of scenarios made up of a basic flow plus alternatives to the basic flow
	Is always named with the goal of the actor that started it beginning with an active verb
	Is a complete self-contained procedure

	Starts with the system in a stable state and leaves it in one
	Has no long time gaps in the flow
	Is procedurally independent of other use cases
	Can be used as the basis for a system test