C.16:5.3 - Separate method, description, model, calibration, and work

M‑METH‑1. MeasurementMethod is one exact U.Method. Its U.MethodDescription may state generic participants, parameters, effects, and measurement conditions; it contains no actual-participant slots and does not claim that measurement occurred.

M‑MODEL‑1. MeasurementModel relates input values and relevant influences to the values attributed to the measurand. In quantity measurement, these are input, influence and output quantities. Identify the model version, assumptions, corrections and domain of validity. Recover what its formula, software function or other expression represents. Use C.16.MR to construct that relation from the indication-producing procedure when it is missing or unsuitable; :5.3.1 connects the construction to interpretation and its next use.

M‑CAL‑1. Name the calibration basis required for the use: reference standard or comparison basis, dated calibration work and result when current, calibration coefficients or corrections, applicable interval, and uncertainty contribution. A calibration certificate or ledger row cites these facts; it does not establish them by being stored.

M‑WORK‑1. MeasurementWork is one exact dated U.Work. First recover every actual performer’s A.13 core for the measurement action, including the same obtaining assignment; then independently admit the Work under A.15.1 from its performance history, at least one obtaining enactsMethod relation, temporal extent, and at least one obtaining locally declared containing-system relation. Add F.6 afterward only when the measurement claim also needs precise assignment-bound attribution. Name the exact measurand through its direct subject relation or an A.6.1 operation-application binding. Name another enacted Method, resource, or concrete participant only when the measurement claim uses its independently obtaining relation or binding. A plan, compatible signature, method description, instrument type, or retained reference establishes none of those actual facts.

C.16:5.3.1 - Construct the measurement relation

1. Start with what is being measured and why. Specify the subject, Characteristic, conditions and required range of interpretation under §§5.1-5.2. Separate what is already known from values the proposed measurement must resolve.
2. Follow how the indication is produced. Describe the procedure connecting the subject to the indication. Recover the measurement principle, applicable calibration relation, or combination of both that connects the quantities. Include intermediate conversions when they change the answer. Physical laws, assessment models and instrument-specific relations come from the relevant subject knowledge; B.5:4.2 helps recover their construction.
3. Include influential conditions. Consider how the apparatus interacts with the subject, what it samples or averages, and its resolution and operating range. Include an influence when its omission could change the interpretation needed for this use. Explain a correction through the relation that gives its direction and magnitude. Retain an unknown influential quantity as unknown, using available bounds or distributions when justified.
4. Determine what the relation resolves. With actual or proposed indications, derive the compatible sought values and their uncertainty under §5.4. If different sought values can produce the same indication, identify that ambiguity. Work a small case or limiting case to expose an omitted influence, inconsistent units or a failed inversion. C.16.IR constructs the joint cases and distinguishes feasible alternatives from bounds that may include unattainable values.
5. Choose the useful return. Supply the interpreted value, interval or conditional result when it answers the question. Otherwise identify which change could resolve the remaining ambiguity: refine the relation, change the measurement arrangement, obtain an applicable calibration or narrow the conclusion. Choose further observation by the distinction it can resolve and the work it demands, using C.11.DUA when that choice needs deliberation. C.16.RM compares changes to models, arrangements and calculation, then carries the selected repair through the interpretation while retaining the wanted quantity.

When an observed discrepancy matters, compare its plausible sources in the subject account, measurement relation and actual arrangement. Change the contribution that can alter the answer; sometimes removing an unwanted influence from the arrangement is more useful than modeling it in greater detail. A model-development result states the relation and what it would establish. A claim about a performed measurement also identifies the work and obtained result under §§5.3-5.5.