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Where? System processes have to be considered in the design, and they may have
to be implemented by blocks of their own.
Guiding questions
?–  What fl ow dependencies are there between the use cases?
?–  Which use cases have an important domain proximity?
SysML elements
Use case diagram, activity diagram. SYSMOD: system process, include relationship,
activity, action, edge, control node (e.g., initial node, decision), composition.
Describe system
processes
System processes
Use cases
82 CHAPTER 2 The Pragmatic SYSMOD Approach
We model the fact that a use case belongs to a system process by means of an
include relationship. Its notation is a dashed arrow pointing from the system process
to the use case and marked with the keyword ?«include?» ( Figure 2.48 ).
We use activities to model the fl ow sequence of system processes. Exactly
one activity belongs to a system process. This relation cannot be represented in
the diagram. SysML and UML know only few notations that combine two diagram
types. But the system process/activity relationship exists in the model.


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