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k.]
[disposal
right not o.k.]
Car usage started Car usage not started
?«essential?»
Start car
usage
[customer identified]
Signal
remove key
?«precondition?» Car is not in use
Ask customer to get
out and lock car; car
will lock automatically
after a defined time.
?«essential?»
Confirm usage
start
Terminate if no PIN is entered
and key is not removed within a
defined time window after
the car is unlocked.
we haven ??™ t modeled yet what they require, or what they create or change. It ??™ s just
as well we haven ??™ t looked into this until now, since we wanted to concentrate on
the logical fl ow (called ??? control fl ow ??? in SysML/UML lingo).
Now??”in a second step??”we add information about this data. This is called
??? object fl ow ??? in the activity diagram. It represents how objects, i.e., data, ??? fl ow ???
96 CHAPTER 2 The Pragmatic SYSMOD Approach
across a fl ow. One step creates an object which is, in turn, the input information for
another step, where it is modifi ed and accepted by a subsequent step, and so on.


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