The Joint Committee for Guides in Metrology (JCGM) maintains and promotes the use of the Guide to the Expression of Uncertainty in Measurement (and associated suite of documents collectively known as the GUM) and the International Vocabulary of Basic and General Terms in Metrology (VIM).

The JCGM is composed of eight international organizations working in the field of metrology – the International Bureau of Weights and Measures (BIPM), the International Organization of Legal Metrology (OIML), the International Organization for Standardization (ISO), the International Electrotechnical Commission (IEC), the International Union of Pure and Applied Chemistry (IUPAC), the International Union of Pure and Applied Physics (IUPAP), the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC), and the International Laboratory Accreditation Cooperation (ILAC). IUPAC is a member of the JCGM since January 1997.

The latest versions of these and related publications can be downloaded free of charge from the BIPM website (here).