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CCU Working Group on Core Metrological Terms (CCU-WG-CMT)

Terms of reference

1. Identify core metrological terms that enter into CGPM Resolutions and national legislation and which are therefore in the interest of Member States.

2. Propose definitions/explanations for these core metrological terms:

  • Considering translation into other languages, in particular into French,
  • Considering requirements concerning machine readability of these terms,
  • Aiming at finding consensus definitions in particular with OIML and involving other NGO stakeholders.

3. Ensure proper representation of these findings in the JCGM WG2 (VIM) upon approval by the CIPM.

4. Make proposals to ensure proper and harmonized representation of CIPM-approved statements in relevant Liaison Organization committees.


  • Prof. Pavel Neyezhmakov  (NSC IM)


  • Dr Michael Stock (Director of the Physical Metrology Department)  (BIPM)


  • Prof. Marc Himbert (LNE-LCM/Cnam)
  • CEM (Centro Español de Metrología)
  • INRIM (National Institute of Metrological Research/Istituto Nazionale di Ricerca Metrologica)
  • LNE (Laboratoire National de Métrologie et d'Essais)
  • METAS (Federal Institute of Metrology METAS)
  • NIST (National Institute of Standards and Technology, United States Department of Commerce)
  • NMIJ/AIST (National Metrology Institute of Japan, AIST)
  • NPL (National Physical Laboratory)
  • NRC (National Research Council of Canada)
  • NSC IM (National Scientific Centre "Institute of Metrology")
  • PTB (Physikalisch-Technische Bundesanstalt)
  • Rosstandart (Federal Agency on Technical Regulating and Metrology)

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20–24 September 2021: 25th meeting of the CCU and related meetings

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