An activity diagram illustrates the dynamic nature of a system by modeling the flow of control from activity to activity. An activity represents an operation on some class in the system that results in a change in the state of the system. Typically, activity diagrams are used to model workflow or business processes and internal operation. Because an activity diagram is a special kind of statechart diagram, it uses some of the same modeling conventions.
Basic Activity Diagram Symbols and Notations
Action states
Action states represent the noninterruptible actions of objects. You can draw an action state in SmartDraw using a rectangle with rounded corners.
Action Flow
Action flow arrows illustrate the relationships among action states.
Object Flow
Object flow refers to the creation and modification of objects by activities. An object flow arrow from an action to an object means that the action creates or influences the object. An object flow arrow from an object to an action indicates that the action state uses the object.
Initial State
A filled circle followed by an arrow represents the initial action state.
Final State
An arrow pointing to a filled circle nested inside another circle represents the final action state.
Branching
A diamond represents a decision with alternate paths. The outgoing alternates should be labeled with a condition or guard expression. You can also label one of the paths "else."
Synchronization
A synchronization bar helps illustrate parallel transitions. Synchronization is also called forking and joining.
Swimlanes
Swimlanes group related activities into one column.
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