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To connect actors directly with ports, we have to switch over to the internal
block diagram. I wrote in Section 2.3.2 how a system context element ( Figure
2.26 ) can be used for modeling. It means that this is where we leave the type level
and continue working on the role level. This level allows us to connect actors??”
more specifi cally, the roles??”with ports. These connections are then formally connectors
rather than associations. You can see the result in Figure 2.30 .
2.4 Modeling Use Cases
Use cases represent the services provided by our system, which means that they
are the central elements in our requirements analysis. The services a system provides
determine that system ??™ s meaning and purpose. This means that all functional
requirements of the use cases have a high priority. All other requirements, such as
response times, weight, or size are of qualitative or supportive nature. That doesn ??™ t
64 CHAPTER 2 The Pragmatic SYSMOD Approach
FIGURE 2-30
System context with ports.
mean that these requirements could not be important.


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