PROJECT DIARY
Project Time 6897
As we analyzed the use case start car usage Paul suddenly discovered the issue
whether or not a customer who canceled but is still in possession of the customer
card can access the car. Since access to a car is supposed to work even without
connection to the reservation center (emergency driving, Project dairy with Project
time 6269 p. 75) it ??™ s impossible to check such a case in their customer system.
Should the on-board computer be fed regularly with a list of suspended cards?
2.4.6 Model Object Flows
Modeling the object flow is shown in Table 2.14 .
You may have noticed as you have been dealing with use case fl ows that data
or objects have not played a particular role yet. All our steps execute actions, but
95 2.4 Modeling Use Cases
FIGURE 2-59
The fl ow diagram for ??? start car usage. ???
act Start car usage [without object flow]
?«essential?»
Identify
customer
?«essential?»
Check usage
right
?«essential?»
Unlock car
?«essential?»
Check disposal right
?«essential?»
Activate
car
Terminate
usage start
[customer not identified]
[usage authorized]
[usage not authorized]
Timeout car
handover
[disposal
right o.
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