Models and modelling
Models and modelling

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7.2 Exercises

Exercise 5

Draw an activity diagram for the main success scenario for the check out guest use case.


Figure 12
Figure 12 The activities in the main success scenario for the check out guest use case

Exercise 6

Examine each of the activities in the check in guest activity diagram shown in Figure 11 (reproduced below) and identify any exceptions, if any.

Figure 11
Figure 11 An activity diagram for the check in guest use case


We identified the following exceptions.

  • Look up reservation: there may not be a reservation corresponding to the stated reservation number.

  • Allocate room: a room of the required type may not be available.

  • Issue key: the key may be lost!

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