Which requirement describes what product components must achieve with a measurement metric?

• A. Performance
• B. Functional
• C. External
• D. Prescriptive

Answer: (A)

Measurement metrics are used to specify how well a product component must perform, giving a quantitative target to meet. That is a performance requirement, because it defines the level of achievement the component must reach and how that achievement will be measured or verified.

Functional requirements describe what function the component must provide, not how well it must perform or be measured. Prescriptive requirements specify exact materials, methods, or processes to use. External requirements deal with interfaces or environmental constraints.

For example, a performance criterion might require a door to resist a certain wind load or to limit air leakage to a precise value, with the metric providing objective evidence of compliance.