SLE
Single Loss Expectancy
The monetary loss expected from a single occurrence of a risk.
SLE is the dollar amount expected to be lost from a single occurrence of a particular threat, calculated as asset value multiplied by exposure factor. It is a building block of quantitative risk analysis: multiplying SLE by the annualized rate of occurrence yields the ALE, which supports cost benefit decisions about controls. Knowing the relationship among SLE, ARO, and ALE is a frequently tested calculation on SY0-701.
Single Loss Expectancy = Asset value x Exposure Factor. The cost of one incident.
Looking SLE up is step one. Getting tested on it is step two.
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