Importance Measure
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Description
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Birnbaum
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Determines the maximum increase in risk when component A is failed compared to when component A is operating. Use Birnbaum importance measures if you can decrease the unavailability of each event a specified amount with the same effort.
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Criticality
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Given that the top event occurs, determines the probability that the failure is a result of the failure of component A. Use criticality importance measures if improvements can be made only to events that have high unavailabilities. (It may be impossible to decrease the unavailability of events after a certain limit, and the unavailability of some events may already be very low.) Additionally, use criticality importance measures if the object is to prioritize maintenance efforts.
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Fussell-Vesely
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Given that the system has failed, determines the probability that component A has contributed to the system failure. Use Fussell-Vesely importance measures if the objective is to minimize the individual contributions of basic events.
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Fussell-Vesely Alternative
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Given that the system has failed, provides a relative indication on how much a primary event is contributing to the top-level event.
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‘ith’ Cut Set
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Provides a percentage of cut set failure probability regarding the failure probability for the top-level event.
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