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The reason is that the principal
wants to offer comfort functions, such as the navigation system or a possibility to
make phone calls.
We are now ready to model the fi ndings we won. We use the derive relationship
between the technical requirements and the essential requirement that belongs
to them. 7 We use containment for the cross-relationship to operate the on-board
computer while driving, and the comfort functions, because this operability
2.2 Determining Requirments
FIGURE 2-9
Requirement to the size of the on-board computer.
req [package] Usability requirements [size of central unit]
?«usabilityRequirement?»
Enclosure size of central unit
?«deriveReqt?»
?«constraintRequirement?»
DIN radio compartment
id???REQ2.1???
text???The on-board computer??™s central unit
has to fit in a DIN compartment.???
7 The containment relationship would be the better choice for this requirement decomposition.
However that relationship also implies a nesting of namespaces. The requirement Radio could not
be located in the package Technical requirements.


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