– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
Search facility:

| Site map | News | Contact us
JCGM Working Group on the Expression of Uncertainty in Measurement (GUM)

Working Group 1 (WG1) of the Joint Committee for Guides in Metrology (JCGM) has responsibility for maintaining the Guide to the Expression of Uncertainty in Measurement (GUM), which is now used worldwide at all levels of the measurement chain, from NMIs to industry.

An updated version of the GUM has been prepared under the name JCGM 100:2008 (GUM 1995 with minor corrections). In addition, the JCGM-WG1 has decided to produce a series of complementary documents to cover some topics of interest in more detail, whilst also directing them to groups of users with different levels of expertise. Please refer to the News from the JCGM-WG1 for information on the latest publications and the documents in preparation.


  • Dr Walter Bich [ISO]

Scientific Secretary:

  • Dr Carine Michotte [BIPM]


  • Prof. Maurice Cox  [BIPM]
  • Dr René Dybkaer  [IUPAC]
  • Dr Charles D. Ehrlich  [OIML]
  • Dr Clemens Elster  [IUPAP]
  • Dr W. Tyler Estler  [BIPM]
  • Dr Nicolas Fischer  [IEC]
  • Prof. D. Brynn Hibbert  [IUPAC]
  • Dr Hidetaka Imai  [ILAC]
  • Mr Luis Mussio  [OIML]
  • Dr Lars Nielsen  [BIPM]
  • Prof. Leslie R. Pendrill  [ILAC]
  • Dr Antonio Possolo  [IEC]
  • Mr Steve Sidney  [ILAC]
  • Dr Adriaan van der Veen  [ISO]
  • Prof. Graham H. White  [IFCC]
  • Dr Wolfgang Wöger  [IUPAP]
  • Corresponding Member: Dr Rüdiger Kessel [IUPAC]
JCGM summary
General information
JCGM Charter
Bibliography on Uncertainty
JCGM Working Group on the Expression of Uncertainty in Measurement (GUM)
JCGM Working Group on the International Vocabulary of Basic and General Terms in Metrology (VIM)
Open access
JCGM documents
JCGM-WG1 documents
Rationale papers on VIM3
FAQs on the VIM3