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The simple representation of the use
cases and the pertaining actors is easy to understand even for people who are not
from the engineering environment. This helps us continue coordinating our model
directly with the principal. Great!
We discussed the possibilities of the communication unit with the domain
experts in a workshop. They consider data transmission via SMS as the cheapest
variant. But the system has to be flexible to ensure that another communication
technique could perhaps be used in the future.
The domain experts require that a so-called emergency driving be allowed.
What they mean by that is a way for a customer to start using a car even if no
connection to the reservation system can be established. For example, some rental
stations are located in underground parking floors where it is often impossible to
reach a cell network.
2.4.2 Describe Use Case Essences
Describing use cases essentially is shown in Table 2.10 .
76 CHAPTER 2 The Pragmatic SYSMOD Approach
We are now ready to deal more closely with each of our use cases.


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