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ITEM TOOLKIT

ITEM Toolkit Manual

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Chapter 12 Event Tree 273<br />

Importance<br />

F-Vesely<br />

The F-Vesely (Fussell-Vesely) importance measure represents an event contribution to the system unavailability. Increasing<br />

or decreasing the availability of events with a higher importance value will have the most significant effect on system<br />

availability.<br />

Birnbaum<br />

The Birnbaum measure for an event represents the sensitivity of system unavailability with respect to changes in the event's<br />

unavailability.<br />

B-Proschan<br />

The B-Proschan (Barlow-Proschan) event importance measure takes into consideration the sequence of event failures within<br />

its calculation. It is the probability that the system fails because a critical cut set containing the event fails, taking into<br />

consideration that the event fails last.

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