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CCM Working Group on the Realization of the kilogram (CCM-WGR-kg)

Terms of reference (Draft):

The terms of reference of CCM-WGR-kg are:

    To advise the CCM about issues concerning the realization of the kilogram before and after the redefinition;

    To cooperate with the WGD-kg in maintaining and disseminating the kilogram;

    To organize key comparisons of primary realizations of the kilogram and to approve the reports and the CMCs;

    To establish and maintain the mise en pratique of the definition of the kilogram;

    To be responsible for the following tasks before the redefinition:

    • To promote cooperation between relevant experiments, in particular for improving the accuracy and for resolving discrepancies;

    • To monitor the results of relevant experiments by following progress of the different projects and to check if the CCM Recommendation G1 (2013) is fulfilled;

    • To support the organization of the extraordinary use of the international prototype of the kilogram in order to calibrate the mass standards and artefacts of the relevant experiments and of the ensemble of reference mass standards of the BIPM;

    • To organize a pilot study and to approve the report in order to validate the mise en pratique before the redefinition.


  • BIPM (Bureau International des Poids et Mesures)
  • DFM (Danish Fundamental Metrology Ltd)
  • INRIM (Istituto Nazionale di Ricerca Metrologica)
  • KRISS (Korea Research Institute of Standards and Science)
  • LNE (Laboratoire National de Métrologie et d'Essais)
  • METAS (Federal Institute of Metrology METAS)
  • MSL (Measurement Standards Laboratory of New Zealand)
  • NIM (National Institute of Metrology)
  • NIST (National Institute of Standards and Technology)
  • NMIA (National Measurement Institute, Australia)
  • NMIJ/AIST (National Metrology Institute of Japan, AIST)
  • NPL (National Physical Laboratory)
  • NRC (National Research Council of Canada)
  • PTB (Physikalisch-Technische Bundesanstalt)
  • UME (National Metrology Institute of Turkey)

  CCM: Upcoming meetings
16–17 May 2019: 17th meeting of the CCM

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Workshop on the mise en pratique (Nov. 2012)