Design the study
Define representative parts, measurement locations, operators, devices/configurations and relevant time or environmental factors. Repeat measurements according to the study plan; “measure the same part twice” is not a complete study.
Name the denominator
A percentage of tolerance and a percentage of study variation are different ratios. Record the statistical scale, denominator and customer criterion before calling a result acceptable.
Avoid universal threshold claims
No generic 10%/30% pass line is supplied here. Choose the applicable method and acceptance criteria for the actual use of the measurement, and keep the raw study and analysis traceable.
Continue your task
Sources and review scope
Reviewed 23 October 2026. Arithmetic examples are labelled separately from source-table facts and standard scope.
NIST — Gauge R&R
Measurement-system study scope: repeatability, reproducibility and related performance issues. No universal 10%/30% acceptance threshold inferred.
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