C.16.RM:4.1 - Align the comparison and target

State the quantity or distinction sought, its subject and operating conditions. Put the expected result and obtained indication on a comparable basis: same quantity, time interval, units and relevant preparation. If the expectation concerns an unconnected source but the reading concerns a loaded source, retain that difference in the relation.

Recover how the indication was produced and interpreted. Separate an observed disagreement from an assumed explanation. A temperature-dependent response may come from the subject, sensor or their interaction; the correlation alone leaves those contributions to be distinguished.

Use C.16.MR when the measurement relation itself is missing. Use C.16.IR to find which alternatives fit an available relation and which distinction remains unresolved. A sufficient bound may already answer the question and end the repair attempt.