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They can
be used in various diagram categories instead.
4.11 General Modeling Elements
FIGURE 4-57
State machine diagram.
stm [block] On-board computer [LED]
Standby
Ready for use
Checking usage right
Usage denied
off
after(20 seconds)
UsageRightSignal
[no authorization]
UsageRightSignal
[o.k.]
after(60 seconds)
CardReaderSignal(data)
CardReaderSignal(data)
CardReaderSignal(data)
after(240 seconds)
[usage start
error]
266 CHAPTER 4 SysML??”The Systems Modeling Language
4.11.1 Rationale
FIGURE 4-58
Example for the ???unlock car??? sequence diagram.
Defi nition
A rationale documents the principles or reasons for a modeling choice.
It is a stereotype ?«rationale?» of the UML element comment.
Your model is full of analysis and design choices. It is normally diffi cult for a
reader of the model to reproduce them. This can lead to diffi culty in understanding
and misunderstandings. This problem can easily be solved by using a comment
that describes the modeling rationale ( Figure 4.59 ).
The stereotype ?«rationale?» characterizes this type of comments.


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