9.2 The Activity Diagram
The principal diagram used to describe activities is called an activity diagram. The activity diagram defines the actions in the activity along with the flow of input/output and control between them. The complete diagram header for an activity diagram is as follows:
act [model element type] activity name [diagram name]
The diagram kind for an activity diagram is act and the model element type can be an activity or control operator.
Figure 9.1 shows an activity diagram for the activity Log On with some of the basic activity diagram symbols. Log On includes call actions that invoke other activities, such as action a2 that invokes the Read User Data activity. Actions have input and output pins, shown as small rectangles, ...
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