Activity diagram Activity diagrams are widely used in system analysis and design to model the behavior of a system, particularly for business processes and workflows. In system analysis and design, activity diagrams are used to model the steps or activities involved in a particular process or use case scenario. Activity diagrams in system analysis and design typically have the following characteristics: Start and end points: The diagram should begin with a start point, which represents the initiation of the process or use case, and end with an end point, which represents the completion of the process or use case. Actions: The actions or steps involved in the process or use case should be represented by rectangular boxes, and the actions should be organized in a logical sequence. Control flow: The flow of control between actions should be represented by arrows. Arrows should indicate the order in which actions are performed and the conditions that determine the path of the process or us
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