We know from the person in charge at SpeedyCar that the fi rst display
appears immediately upon the beginning of the car usage. That is, before the engine
is started and before any kilometer has been driven. The use case is triggered by an
internal state transition. As soon as the system changes to the usage state, the display
starts showing usage data. Leaving the usage state causes the use case to end.
I ??™ m sure you would have noticed that we are in the middle of analyzing potential
use cases. We normally don ??™ t start identifying use cases on our own hidden in
our closets. We identify our use cases in a workshop. The participants are chosen
such that we obtain as much knowledge about all disciplines involved in the system
as possible. We then determine potential use case candidates in small groups.
We write our use cases on metaplan cards. Such cards are also available fi ttingly
in the form of use cases, i.e., ellipses. We can optionally note the pertaining actors,
the information fl ow, open questions, and other information on the back of the
cards.
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