Decision Rules

Risk Logic

Simple acceptance ignores the uncertainty range entirely. More complex decision rules incorporate guard bands that pull the pass limit further inside the tolerance to prevent the shipping of bad parts. False rejection increases costs but ensures end-user safety.

False acceptance occurs when rules are too loose.

Tolerance Impact

Product specifications influence the severity of the chosen strategy. If measurement errors are high relative to the specification spread, the decision rules must be aggressive to protect product integrity. Accuracy becomes the primary focus here.

Operators look for a clear binary result.

Verification Sequence

Quality managers choose a rule based on the shared risk agreed with the customer. Because different decision rules alter the yield of a manufacturing line, the choice impacts the final unit price. Laboratory certificates must explicitly name the chosen rule to validate the compliance statement.

It anchors the whole inspection process.