A lower count of findings may reflect less inspection rather than better output. A useful rate keeps the relevant observation opportunity visible.
ASQ's statistical process control resources emphasise appropriate use of process data to understand behaviour. ASQ — statistical process control.
Define the comparison
For an appearance review, record what population and characteristics were actually inspected. Different product complexity or inspection coverage can make two apparently similar rates difficult to compare.
Keep changes in method visible
If the reporting definition changes, identify the break before presenting a trend. Do not turn a smaller numerator into an improvement claim without its denominator and context. The goal is a fair comparison that supports a real process decision.
Source reviewed 25 October 2026. Interpretation and original diagrams: PLUSHIP / Qunhe. Examples are illustrative.
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