C.16:3 - Problem Frame

A measurement is often compressed to subject → value. That abbreviation hides the measurand, the quantity or characteristic intended to be measured, the model relating inputs to an output quantity, the calibration basis, the work occurrence, and the uncertainty carried into later use. It also makes raw instrument output, a displayed indication, an attributed measurement result, a diagnostic interpretation, and a criterion verdict look like one object.

The failure becomes visible when two readings are compared, when a detector output is treated as the state of the subject, or when a dashboard value is reused as evidence, assurance, acceptance, or decision authority. C.16 restores the measurement-specific objects before any receiving use is judged.