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If product families or several solution
variants are to be evaluated, then we need an additional way of differentiation.
We will deal with this issue in Section 2.8.1.
FIGURE 2-8
Requirements hierarchy.
req [package] Functional requirements [selection]
?«functionalRequirement?»
Car usage without staff
?«functionalRequirement?»
id???REQ1???
text???Cars to be picked up
and returned by the
customers without assistance.???
?«functionalRequirement?»
Identify customer
?«functionalRequirement?»
id???REQ1.1???
text???The system must do
unique authorization of
customers.???
?«functionalRequirement?»
Grant access to car
?«functionalRequirement?»
id???REQ1.7???
text???The system must be
able to grant authorized
customer access to car.???
?«functionalRequirement?»
End usage of car
?«functionalRequirement?»
id???REQ1.3???
text???The system must be
able to allow customer to
end usage of car.???
?«functionalRequirement?»
Start using car
?«functionalRequirement?»
id???REQ1.2???
text???The system has to
allow a customer to start
using the car.


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