– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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The rationale behind VIM3

    The second edition of the International vocabulary of basic and general terms in metrology (VIM) was published in 1993. Recognizing the need to cover measurements in chemistry and laboratory medicine for the first time, as well as to incorporate concepts relating to metrological traceability, measurement uncertainty, and nominal properties, the preparation of a new edition began in 1997.

    Development of this third edition raised some fundamental questions about different philosophies and descriptions of measurement, as summarized in the 'Introduction' (see p.8 of the VIM3). These differences sometimes lead to difficulties in developing definitions that could be used across the different descriptions. No preference is given in the third edition to any of the particular approaches.

    The change in the treatment of measurement uncertainty from an Error Approach (sometimes called Traditional Approach or True Value Approach) to an Uncertainty Approach (see the GUM) necessitated reconsideration of some of the concepts appearing in the second edition of the VIM.

    The VIM3 may appear to be a loosely ordered collection of definitions, but is in fact a refined (albeit imperfect) concept system*, as might be expected from a foundational work. Its title is now International vocabulary of metrology – Basic and general concepts and associated terms, in order to emphasize the primary role of concepts in developing a vocabulary.

    The collection of papers presented here under "Further reading..." provides more detailed background information about some of the concepts in the VIM3.

    *. ISO 1087-1:2000: 3.2.11

Many articles have been published in the scientific literature explaining the rationale behind VIM3.
The following are a selection of them:

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