Standard decision rule and measurement uncertainty
FAKT as a standard decision rule applies the ‘Simple Acceptance Criteria’ together with the indirect consideration of measurement uncertainty. Simple acceptance is also called ‘shared risk’ because the probability of being outside the tolerance limit can be up to 50% in the case of a measurement result being exactly on the tolerance limit (assuming a normal, symmetrical distribution of measurements). According to this rule, the test laboratory and the client of the measurement result agree, implicitly or explicitly, to accept as compliant (and reject otherwise) a test result whose property has a measured value in the tolerance range.
To keep the possibility of erroneous decisions at acceptable levels, an upper limit for the measurement uncertainty Umax in accredited test procedures is agreed upon with the customer.
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