Description: model based on cases with specialized terminology describing the actual needs of the system function prototype. The Use Case Model, a practical system functional requirements are expressed as a multiple system acts (System Behavior). To facilitate the description of the system dynamic process, in cases with the use of model also plans activities (Activity Diagram) to describe the state of the system of internal change process (also supporting state plans and events flow diagram). Stimulate a system of the first sources of information and targets are known as role (Actor), and when the system will occur after the first source of information to respond. Only role beyond the borders of the system, with cases actually model performance of the system and outside the action and counteraction of
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