– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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CCPR Working Group on CMCs (CCPR-WG-CMC)

Terms of reference:

The terms of reference of the WG-CMC are to:

    coordinate and approve the definition of service categories requested by RMOs and to maintain lists of service categories, and – where necessary – rules for the preparation of CMC entries;

    agree on detailed technical review criteria;

    coordinate and, if necessary, conduct inter-regional reviews of CMCs submitted by RMOs for posting in Appendix C of the MRA;

    provide guidance on the range of CMCs supported by particular key and supplementary comparisons;

    suggest to the WG-KC areas where additional key and supplementary comparisons may be needed;

    coordinate the review of existing CMCs in the context of new results of key and supplementary comparisons.


  • Dr Marek Smid  (CMI)


  • Dr Sten Bergstrand (BIPM)
  • Mr Anatolii Bescupschii (NMI (MD))
  • Dr Peter Blattner (METAS)
  • Dr Catherine Cooksey (NIST)
  • Mrs Teresa Goodman (NPL)
  • Dr Boris Khlevnoy (VNIIOFI)
  • Dr Annette Koo (MSL)
  • Prof. Dr Stefan Kück (PTB)
  • Dr Dong-Hoon Lee (KRISS)
  • Dr John Lehman (NIST)
  • Dr Thiago Menegotto (INMETRO)
  • Dr Jacques Morel (METAS)
  • Dr Maria Nadal (NIST)
  • Dr Susanne Picard (BIPM)
  • Dr Maria Luisa Rastello (INRIM)
  • Mr Reinhardt Sieberhagen (NMISA)
  • Dr Marek Smid (CMI)
  • Dr Joële Viallon (BIPM)
  • Chairs of the Technical Committees of regional metrology organizations (RMOs) dealing with photometry and radiometry.

Membership rules:

  • Chairpersonship rotates among the RMOs.
  • Term of chairperson office is 4 years unless reappointed officially.
  • Each RMO TC chair may appoint one expert as member.
  • WG-CMC Task Group chairs are invited as observers.
  • Meeting attendance is by invitation only.


  • TG1
  • Use of comparison results in assessment of CMC claims Annette Koo (MSL)
  • TG2
  • Update Excel PR CMC Supporting evidence file Maria Nadal (NIST)
  • TG3
  • Clarify and harmonize the CMC review process Teresa Goodman (NPL)
  • TG4
  • Recommending a CMC structure for fibre optics Jacques Morel (METAS)

  CCPR: Upcoming meetings
9–13 May 2022: 25th meeting of the CCPR and related meetings

CCPR summary
General information
Members of the CCPR
KC and SC registration form
CCPR workshops
List of planned RMO comparisons in PR
CCPR publications and bibliography
CCPR working groups
Summary of comparisons in PR
Photographs of the CCPR
Open documents
CCPR documents
CCPR-WG-CMC documents
CCPR-WG-KC documents
CCPR-WG-SP documents