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2.4.3 Describe System Processes
Describing system processes is shown in Table 2.11 .
As we identifi ed our use cases we noticed that there can be dependencies
between use cases with regard to their sequence of execution. That is, only once a
81 2.4 Modeling Use Cases
certain use case has been fully traversed can other use cases be executed. We use
system processes to describe this relation.
A system process describes a fl ow that extends over several use cases. It consists
of a set of use cases that have a domain-logical fl ow sequence.
A system process is a special use case with the stereotype ?«systemProcess?» . We
use a different notation ( Figures 2.48 and 3.87) to better distinguish it from system
use cases. Its name is a noun without verb.
Not every use case belongs to a system process; only the ones with a fl ow
dependency to other use cases do. These are often use cases that are in the same
package, all belonging to a system process.
System processes serve two distinct purposes. First, they document fl ow
dependencies in a compact and clear way.


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