Interaction operators, denoted by
boxes, infl uence the possible fl ow. The operator par is used in Figure 2.71 .
You have to pay attention to obtain a meaningful degree of details for our messages.
You have a certain degree of freedom depending on your goal. Do you want
to describe conceptual messages and interfaces, or do you want to examine all
technical details already in this step? We are moving on a more conceptual level in
Figure 2.71 .
FIGURE 2-71
System/actor interaction for ??? start car usage. ???
sd [block] On-board computer context [system/actors start car usage]
?«system?»
:On-board computer
:Customer :Reservation
system
:Central locking
system
Apply card
SigLED(yellow, blinkingtrue)
SigLED(green,blinkingfalse)
SigKey(removedtrue)
Unlock car
PIN request
PIN
Deactivate
drive-away
protection
Request usage right
Usage right
:Drive-away
protection
par
114 CHAPTER 2 The Pragmatic SYSMOD Approach
A complete modeling process requires us to transfer all fl ow variants from the
activities to a sequence diagram, regardless of whether we use an interaction operator
for a variant or another sequence diagram.
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