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152 Model Driven Systems Development with Rational Products
We now examine how the product structure and the product requirements can
be related: One of the important consequence of having requirements as
model elements is that it allows the designer to specify which components in
the system satisfy a given set of requirements. This is called the
allocation
process
. We show an example of requirement allocation in Figure 7-4, where
the part on the left hand side represents some elements of the RSW, and the
part on the right hand side is a hierarchy of requirements. One way to perform
allocation is to use the <<satisfy>> dependency. In the figure, the Rain
Sensing Wiper model element is allocated to the requirement named
Automatic Wiping. Any element in SysML can be used to satisfy a
requirement.
Another way to display allocation is to use a dedicated compartment named
requirement related. This compartment displays the status of a set of derived
properties related to requirements. In Figure 7-4 the element ECU displays
this compartment: The ECU element is allocated to the requirement named
Use dedicated ECU.
Figure 7-4 Example of requirement allocation