GRC Engineering
Loss Event Frequency (LEF)
A FAIR taxonomy variable measuring how often a threat agent successfully causes a loss event per year. Calculated from Threat Event Frequency multiplied by Vulnerability (probability of success given current controls). One of two root inputs to annualized loss expectancy.
From the library
The full analysis on Loss Event Frequency (LEF).
The article is where the term meets the practitioner. Read how this concept actually shows up in audit, in remediation, and in the boardroom.
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