Which term describes The percent value or functionality of an asset that will be lost when a threat event occurs?

• A. Single Loss Expectancy (SLE)
• B. Magnitude of Impact (Risk Impact)
• C. Exposure Factor (EF)
• D. Return on Investment (ROI)

Answer: (A)

The number described is Exposure Factor. It represents the portion of an asset’s value (or functionality) that will be lost when a threat event occurs, expressed as a percentage or decimal. For example, if an asset is valued at $100,000 and the Exposure Factor is 0.25, the loss would be $25,000 in that incident.

This concept is also used to compute Single Loss Expectancy, which is the monetary value of loss from a single incident (SLE = Asset Value × Exposure Factor). Other terms like Return on Investment focus on profitability rather than loss from a single event, and Magnitude of Impact is a broader measure of overall consequence that might be expressed in different ways, not specifically the percentage of asset value lost.