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ITEM TOOLKIT

ITEM Toolkit Manual

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272 <strong>ITEM</strong> ToolKit Getting Started Guide<br />

4. The Event Tree canvas is also updated with the analysis results in the Result column.<br />

5. Select Summary from the Analysis menu to view the results. The Event Tree Results dialog box appears.<br />

Understanding Analysis Results<br />

Unavailability Q: Represents the probability that the component or system is unavailable at any given time. “Q” equals the<br />

probability that the system is unavailable.<br />

Failure Frequency W: This is the term used by the system to represent the unconditional failure intensity. The<br />

unconditional failure intensity is the probability that the system or component fails per unit time, given that it was working<br />

correctly at time zero. “W” is equal to the number of expected system failures.<br />

No. of Cut Sets: Represents a group of events that will cause system failure if and when they occur together.

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