What would operational testers use to determine whether a system meets operational performance parameters?

Measures of Effectiveness

Explanation:

The Measures of Effectiveness (MOE) are measures specifically created to assess system operational environment, behaviour and capability as they relate to the achievement or attainment of the system's objectives, goals and tasks. MOE actually measures the probability that a system will perform as required and perform as expected.

FOr MOE to be effective as an operational tester, the following characteristics must be available; testable, complete, simple, quantitatively measurable and easily measurable.

Therefore in order to determine whether a system meets its operational performance parameters Measures of Effectiveness must be employed.