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???
bdd [package] on-board computer context [customer]
Customer
?«system?»
On-board computer
10 Graphical User Interface for user??“system interaction. The term refers to software systems.
11 Human Machine Interface??”a man??“machine interface, e.g., key buttons, levers, light-emitting
diodes.
49 2.3 Modeling the System Context
FIGURE 2-13
External system: reservation system.
bdd [package] On-board computer context [external system]
Reservation
system
?«system?»
On-board computer
describe user systems as interaction partners, since they could be more important
than the users behind them from our system ??™ s perspective.
Similar to an external system a user system is denoted as a box, but additionally
with a user symbol ( Figure 2.14 ).
We can additionally model the individual who operates the user system. For
formal reasons, you cannot draw a solid line (association) between a user and a
user system, i.e., between two actors. The relationship between any two actors is
represented by means of an information fl ow.


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