To declare a part "good," the measured value must be within the specification limit by a margin at least equal to the measurement uncertainty . This effectively shrinks the "acceptance zone". Proving Nonconformity (Rejection):

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The set of values where conformity is verified with an agreed probability (defaulting to 95% in the 2017 version). Rejection Zone:

Kael paused. The name of the standard hung in the air. "What about it?"