
126 Decision Based Design
1. The method should be able to report the overall performance level
(effective age) of the system even if the components have different
ages (allowing partial repair).
2. The method should be able to include subjective information about the
components’ value degradation acquired from end users or experts.
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3. If all the components are the same age, the method should reect
that fact in the effective age of the system (it should be the same as
the age of the components).
4. The measure should account for the relative importance or criticality
of the components.
5. A high-performing component should compensate for ...