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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