A coverage of 1 means full coverage. Figure 5.10 shows that
the card reader meets 40 percent of the functional requirement. The same applies
to the weighted verify relationship. The coverage describes how muchof the
requirement in percent (a number between 0 and 1) is verifi ed by the test case.
5.7 Continuous and Secondary Use Cases
Defi nitions
A continuous use case is a special use case that starts in a defi ned system
state and continually supplies results. No fi nal result is required.
It is a stereotype ?«continuous?» of the UML elements use case and activity
(Figure 5.11).
A secondary use case is an incomplete use case fragment. It lacks a domain
trigger, a result, or an actor
It is a stereotype ?«secondary?» of the UML elements use case and activity
(Figure 5.11).
280 CHAPTER 5 Systems Engineering Profi le ??”SYSMOD
A normal use case begins with a trigger; it has a temporally coherent fl ow and
ends with a result. Normal use cases are not suitable for all kinds of services provided
by a system. For example, control circuits often have no domain triggers
and hardly ever a fi nal result.
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