Criterion Validity

A psychometric property indicating whether an instrument's scores relate to some external measurable criterion. In practice, this is assessed by comparing the instrument's results with scores from another established measurement tool administered concurrently. For example, when validating an ASL translation of the System Usability Scale, researchers compared ASL-SUS scores with an independently administered adjective rating scale to confirm both instruments measured the same underlying concept of perceived usability. Strong criterion validity is essential for ensuring translated or adapted instruments produce comparable results to their originals.