What concept measures a system's ability to meet specific mission requirements?

The concept that measures a system's ability to meet specific mission requirements is system effectiveness. This term captures how well a system performs its intended tasks and fulfills the needs it was designed to address. Effectiveness takes into account not just the outcomes achieved but also the relevance and appropriateness of those outcomes in meeting the strategic objectives or mission requirements set for the system.

When evaluating a system’s effectiveness, one assesses various metrics and performance indicators that define success in achieving desired goals. This involves looking at the system in the context of its intended purpose and determining whether it delivers the expected value.

System reliability, while important, focuses primarily on the ability of the system to function without failure over a specified period, which is a subset of what is considered in overall effectiveness. System efficiency refers to the optimum use of resources to achieve outputs and does not inherently reflect the extent to which those outputs meet mission requirements. Lastly, system output simply refers to the tangible or quantifiable products or results of a system's processes, without relating those outputs back to their purpose or effectiveness.