Activity Diagram

1. Activity diagrams are the object oriented equivalent of flow charts and data flow diagrams from structured development
2. Activity diagrams describe the workflow behavior of a system
3. The process flows in the system are captured in the activity diagram
4. Activity diagram illustrates the dynamic nature of a system by modeling the flow of control from activity to activity

• An activity diagram contains activity states. An activity state represents the execution of a statement in a procedure or the performance of an activity in a workflow
• An activity state waits for the completion of its computation. When the activity completes then execution proceeds to the next activity state within the diagram
• When to use Activity Diagrams?
1.  a complex operation
2.  a complex business rule
3.  a single use case
4.  several use cases
5.  a business process
6.  software processes

element of activity diagram