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Only then will the
customer have started using the car. Beginning of the usage is stopped if either
the PIN is not entered or the key is not removed within this time window. In this
case, the car is automatically locked again. The business terms and conditions of
SpeedyCar say that a car is deemed to have been offi cially given to a customer
upon removal of the key.
This means that the use cases unlock car and activate car are one single use
case. The trigger, apply customer card , normally leads to the result that the car
FIGURE 2-33
A potential use case called ??? activate car. ???
2.4 Modeling Use Cases
uc [package] Car usage [activate car]
Activate
car
Customer
PIN
70 CHAPTER 2 The Pragmatic SYSMOD Approach
usage has begun. Accordingly, we call the use case start car usage ( Figure 2.35 ).
There would be no negative effect if you were not to yield this fi nding in this
phase; it would be perfectly alright if you were to fi nd it later when you look at
the details of your use cases (see Section 2.4.5), or if you were never to merge
your use cases.


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