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The UML action model that describes the elementary and executable actions
is integrated in the activity model. This includes, for example, simple actions that
write or read a value, or actions that create or delete objects. All these actions
together allow us to create executable fl ow models, for example, to be able to simulate
the system in the model and test it at an early stage (catchword: executable
specifi cation). However, current modeling tools concentrate on state machines
with regard to the execution of models.
3.6.1 Activity
FIGURE 3-35
Notation of an activity with and without diagram frame.
Action
Name of activity ?«precondition?» condition
?«precondition?» condition
act Name of activity
Action
?«precondition?» condition
?«precondition?» condition
11 Object Constraint Language [52].
Defi nition
An activity describes flows consisting of several elementary actions. A flow can be
parallel or synchronized, or it can be forked and joined on the basis of conditions.
Similar to a state machine or an interaction, an activity is a complete behavior element.


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