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Calibration · Glossary

What is a Decision Rule?

how pass or fail is decidedCalibration

A decision rule defines how measurement uncertainty is taken into account when stating that an instrument passes or fails its tolerance.

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Decision Rule Explained

Simple acceptance compares the reading with the tolerance and ignores uncertainty. Guarded acceptance uses a guard band. ISO/IEC 17025 requires the rule to be agreed with the customer.

The rule changes the risk of false acceptance and false rejection.

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Calculators for Decision Rule

CalculatorGuard Band CalculatorFree online calculator with formula and worked example.

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Frequently Asked Questions

What is a Decision Rule?

A decision rule defines how measurement uncertainty is taken into account when stating that an instrument passes or fails its tolerance.

What is simple acceptance?

Passing if the reading is within tolerance, usually acceptable when TUR is high.

Where is guidance?

ILAC G8 and JCGM 106.

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