Activity diagram
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In the Unified Modeling Language, an activity diagram represents the business and operational step-by-step workflows of components in a system. An Activity Diagram shows the overall flow of control.
In SysML the Activity diagram has been extended to indicate flows among steps that convey physical element (e.g., gasoline) or energy (e.g., torque, pressure). Additional changes allow the diagram to better support continuous behaviors and continuous data flows.
[edit] Description
In UML 1.x, an Activity diagram is a variation of the UML State diagram where the "states" represent actions, and the transitions represent the activities that happen when the operation is complete.
The UML 2.0 Activity diagram, while similar looking to the UML 1.x Activity diagram, now has semantics based on Petri nets.
In UML 2.0, the Interaction Overview diagram is based on the Activity diagram.
