For our case study we have chosen an airport—the UML Airport. Anyone who has ever been on a flight will have no problems understanding our example.
We will restrict our example to those areas of the airport that passengers are in contact with during departure, meaning we will take a closer look at passenger check-in and boarding. Figure 2.1 illustrates how passenger services can be distinguished from other areas of the airport. It shows the various stages that passengers go through until they are seated in the airplane, buckled up, and the plane is ready to take off. Not all stages passengers go through are related to passenger services. The stages that belong to passenger services are framed and printed in italic font.
A sequence of steps like this is called a scenario. However, the depicted scenario is only one of many possible scenarios. The following exceptions are possible for passenger check-in and boarding:
The passenger only has carry-on luggage.
The...