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The pertaining use cases are represented each by an action in the activity. The
action is denoted as a rectangle with rounded corners. The name of the action??”
that is, in this case the name of the use case??”appears inside the rectangle. The
small fork in the lower right corner shows that this action invokes an activity.
It is an activity that describes the fl ow of the corresponding use case (see
Section 2.4.5).
Our next job is to connect the actions, i.e., to arrange them in some sequential
order or fl ow. The fl ow begins at the initial node, which is a black circle, followed
by the actions, and ends at the activity fi nal node, which is also a black circle with
an encompassing circle.
We defi ne a system process called car usage and then continue modeling
the dependencies of the use cases start car usage , end car usage , and car usage
data . You can see the result in Figure 2.49 . Displaying the usage data and ending
the usage can happen independently of one another.
Independent fl ows are expressed by a fork node in activity diagrams.


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