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We
will consider it secondary for the time being until there will be a final decision
either for or against the navigation system.
54 CHAPTER 2 The Pragmatic SYSMOD Approach
FIGURE 2-21
The system context model for the on-board computer.
FIGURE 2-22
Structure of the on-board computer.
bdd [package] System context
Customer
Reservation
system
Car service
employee
Car movement
data
Car drive-away
protection
Central locking
system
Car management
system
Status request
?«flow?»
Billing system
External systems of car
Car ignition
Battery
Temperature
Receives usage data via
SMS upon car return
?«system?»
On-board computer
Windshield
System for configuring
and testing the on-board
computer in operation
bdd [package] On-board computer
?«system?»
On-board computer
?«block?»
Service
?«block?»
On-board computer
control
?«block?»
Card reader
?«block?»
Navigation system
2.3.2 Model System/Actor Information Flow
Modeling the system/actor information flow is shown in Table 2.7 .
Based on the system context diagram we now look at the incoming and outgoing
information for our system.


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