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If you have few essential steps you will have to supply more information.
If you have many essential steps you won ??™ t have to go much into breadth any
2.4 Modeling Use Cases
FIGURE 2-46
Alternative essences for ??? start car usage. ???
uc [package] Car usage [alternative essences start car usage]
Essence alternative 1
Identify customer
Check reservation
Unlock car
Check customer PIN
Activate car
Remove key
Confirm usage start
Essence alternative 2
Identify customer
Unlock car
Activate car
Start car usage
Start car usage
80 CHAPTER 2 The Pragmatic SYSMOD Approach
more later on ( Figure 2.47 ). Both approaches should eventually yield a description
of the same information. The only difference is that it is distributed differently over
the abstraction levels. I tend to prefer the approach with many essential steps.
It ??™ s easy to create essential descriptions as soon as you have developed a feeling
for the abstraction required. It is generally not a good idea to conduct long
academic discussions in an effort to obtain the perfect essence.


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