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The most important thing about a system is the services it offers to its environment.
A system is useless without them. I ??™ ve emphasized this fact over and over
again in the previous sections. Accordingly, we will now have a closer look primarily
at the use cases as the representatives of services, and we will realize them
systematically in our design.
Our approach is shown in Figure 2.70 . We begin with an outer view and develop
an interaction diagram of the system/actor dialog (Section 2.7.1). From there we
can derive our system ??™ s interfaces (Section 2.7.2). We continue from the outer
view toward the inside to model the system structures. We identify blocks, look
PROJECT DIARY
Project Time 7989
The marketing department of SpeedyCar expressed their concerns about the
fact that the regular car radio has to be removed to make room for the on-board
computer. Car radios have increasingly evolved into a multimedia center in cars.
That ??™ s a development that the customer requires, but the on-board computer
cannot catch up with.


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