ISO/IEC GUIDE 98-4:2012 PDF

Scope: This document provides guidance and procedures for assessing the conformity of an item (entity, object or system) with specified requirements. The item might be, for example, a gauge block, a grocery scale or a blood sample. The procedures can be applied where the following conditions exist: -the item is distinguished by a single scalar quantity (see 3.2.1) (a measurable property) dened to a level of detail sufficient to be reasonably represented by an essentially unique true value; NOTE The GUM provides a rationale for not using the term 'true', but it will be used in this document when there is otherwise a possibility of ambiguity or confusion. -an interval of permissible values of the property is specified by one or two tolerance limits; -the property can be measured and the measurement result (see 3.2.5) expressed in a manner consistent with the principles of the GUM, so that knowledge of the value of the property can be reasonably described by (a) a probability density function (see 3.1.3) (PDF), (b) a distribution function (see 3.1.2), (c) numerical approximations to such functions, or (d) a best estimate, together with a coverage interval and an associated coverage probability.

ISO/IEC GUIDE 98-4:2012 Referenced Document

ISO 3534-1:2006 Statistics - Vocabulary and symbols - Part 1: General statistical terms and terms used in probability
ISO 3534-2:2006 Statistics - Vocabulary and symbols - Part 2: Applied statistics
ISO/IEC 17000:2004 Conformity assessment - Vocabulary and general principles

2012 ISO/IEC GUIDE 98-4:2012 Uncertainty of measurement.Part 4: Role of measurement uncertainty in conformity assessment