![]() In UML semantics, Activity Diagrams are reducible to State Machines with some additional notations that the vertices represent the carrying out of an activity and the edges represent the transition on the completion of one collection of activities to the commencement of a new collection of activities. In operation specifications, to describe the logic of an operation.Īctivity Diagram vs State Machine Diagram Activity Diagram.To describe a system function that is represented by a use case.To model a human task (a business process, for instance).What is Activity Diagram?Īctivity diagrams describe activities which involve concurrency and synchronization, which are a variation of state diagrams that focuses on the flow of actions and events. State Machines give us the means to control decisions and each state is like a 'mode of operation' for the object which behaves differently depending on its state. They describe all of the possible states that a particular object (or even the entire system) can get into. ![]() ![]() In most OO techniques, state diagrams are drawn for a single class to show the lifetime behavior of a single object. A state diagram (also called state machine diagram, statchart and start transition diagram) is a type of diagram behavior diagram in UML. ![]()
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