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Working Groups

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Working Group Members

JCGM Working Group on the Expression of Uncertainty in Measurement (JCGM-WG1:GUM)


Dr Walter Bich

National Institute of Metrological Research/Istituto Nazionale di Ricerca Metrologica


Executive Secretary

Dr Carine Michotte

Bureau international des poids et mesures


List of meetings

Meetings and related documents

Upcoming Meeting

  • From 14 to 17
  • November
  • 2023

Past Meeting

  • From 09 to 12
  • May
  • 2023

Past Meeting

  • From 29 November
  • to 02 December
  • 2022

Past Meeting

  • From 06 to 09
  • September
  • 2022

jcgm-wg1 mission


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, which is used worldwide at all levels of the measurement chain, from NMIs to industry, under the name JCGM 100:2008 (GUM 1995 with minor corrections).

In addition, the JCGM-WG1 has extended the scope of the GUM by producing a number of complementary documents to cover related topics in more detail. In this new perspective, JCGM100:2008 and all the complementary publications are parts of the GUM, which encompasses the whole suite of documents.

Please refer to the GUM Newsletter for information on the latest publications and documents in preparation.