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For example, we modeled the
actor customer as a user of our system. Would you have chosen the same actor? Or
perhaps opted rather for the card reader ? Or the customer card ? ( Figure 2.19 ).
The customer is just the one who holds the card in front of the card reader,
and the card reader is just the mediator between the customer card and the onboard
computer control.
2.3 Modeling the System Context
FIGURE 2-17
Example for an actuator and a sensor.
bdd [package] On-board computer context [actuator and sensor]
Central locking
system
Car movement
data
?«system?»
On-board computer
FIGURE 2-18
Example for a mechanical system.
bdd [package] On-board computer context
[mechanical systems]
Windshield
?«system?»
On-board computer
52 CHAPTER 2 The Pragmatic SYSMOD Approach
And what about the processors in the card reader, or the cable between the
card reader and the on-board computer, or ??¦ ; are they all actors?
There can be good reasons to model each of the solutions mentioned above. You
can surely imagine the kind of workshops where all these are discussed.


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