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You can see the result in Figure 2.44 .
Essential steps are denoted as comments in the model ( Figure 2.45 ) or in the
documentation fi eld of the use case, provided the SysML/UML tool supports this.
It is mandatory in both cases to be able to generate the essence in the form
of a report from the modeling tool; otherwise you won ??™ t have a clear description,
and the information might go under in the depths of the modeling tool.
The sequence of the use case steps is not yet relevant at this point. We naturally
write them down in a meaningful sequence. However, the sequence often
depends on technologies and doesn ??™ t play a particularly important role on the
domain level. For example, we don ??™ t want to think about the sequence of the
PIN input or the key removal now. Of course, we will think about these things a
lot later on when we will describe the use case in detail and with the respective
technologies in mind (see Section 2.4.5).
The essence we found is not the only possible solution. You can see two alternative
essences in Figure 2.


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