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Things will not always fi t as neatly as
they did in the fi rst two steps, when the result of the fi rst step was the input
object for the second step. For example, unlock car does not require any data, and
it doesn ??™ t create any either. But in our next step, check disposal right , we need the
customer ??™ s PIN check code to be able to check the PIN entered for correctness.
This value is hidden somewhere in our customer object. We use the Detour pattern
to make sure the data get there.
We haven ??™ t explicitly modeled the data outgoing from the step check disposal
right , since this is a yes/no statement.
Altogether, we obtain the activity model shown in Figure 2.62 . We continue
using the same approach with each of the other steps to detail them by adding
another activity.
In the activity start car usage , we described the step check usage right in
another activity model. Here we have to pay particular attention to the transition.
The incoming and outgoing data of this step have to correspond to the incoming
and outgoing data of the detailed activity.


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