Question 1 · Difficulty 2/5
Which of the following best describes the Exposure Factor (EF) used in quantitative risk analysis? (Select the best answer.)
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Correct answer: B
The percentage of an asset's value lost in a single realized threat event
The Exposure Factor (EF) is expressed as a percentage (0 to 1.0) representing the proportion of an asset's value that would be destroyed or lost in a single loss event; it is multiplied by the Asset Value (AV) to calculate the Single Loss Expectancy (SLE = AV x EF). The total financial value of the asset is the Asset Value (AV), a separate input. The estimated number of occurrences per year is the Annualized Rate of Occurrence (ARO). The annualized safeguard cost is used in cost-benefit analysis to determine whether a control is economically justified, not in the EF definition.