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64 .
99 2.4 Modeling Use Cases
FIGURE 2-62
The activity ??? start car usage ??? with object fl ow.
act Start car usage
?«essential?»
Activate
car
Terminate
usage start
[customer not identified]
[usage authorized]
[usage not authorized]
Timeout
Car handover
[Disposal right o.k.]
[Disposal right
not o.k.]
Car usage started Car usage not started
?«essential?»
Start car
usage
[customer identified]
Car
?«essential?»
Identify
customer
Customer
?«essential?»
Check usage
right
Customer
?«essential?»
Unlock car
?«essential?»
Check disposal
right
PIN check code
?«precondition?» Car is not in use
K
K
?«transformation?»
Customer.pinCheckCode
?«essential?»
Confirm usage
start
Usage
right
N
N
Usage
right
100 CHAPTER 2 The Pragmatic SYSMOD Approach
The continuous activity can be stopped only by the signal end usage .
Otherwise, once started, it would run continually. The action get car usage data
has two incoming object fl ows. An object token is transported over the edge from
the time event updating to the action once every minute.


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