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Sub-Group on CMCs and the DimVIM (sWG-CMC)

Task description:

  • to establish and maintain lists of service categories (DimVIM) and, where necessary, rules for the preparation of CMC entries (DimVIM Guide);

  • to agree on detailed technical review criteria;

  • to coordinate and, where possible, conduct inter-regional reviews of CMCs submitted by RMOs for posting in Appendix C of the CIPM MRA;

  • to provide guidance on the range of CMCs supported by particular key comparisons;

  • to identify areas where additional key and supplementary comparisons are needed;

  • to monitor the review of existing CMCs in the context of new results of key and supplementary comparisons;

  • to monitor and enforce the corrective actions resulting from key and supplementary comparisons, in cooperation with the RMO's concerned.

DimVIM: Multilingual CMC classification scheme


  • Dr Brian Eves  (NRC)


  • Mr Majed Al Senaidi (EMI)
  • Prof. Karina Beatriz Bastida (INTI)
  • Mr Oleksandr Kostrikov (NSC IM)
  • Mr Oelof Kruger (NMISA)
  • Dr Antti Lassila (MIKES)
  • Dr Emilio Prieto Esteban (CEM)
  • Ms Xue Zi (NIM)

including the following ex officio members:

  • chairpersons of the RMO technical committees for length

The CCL has approved a CMC classification scheme for length services, generally referred to as the DimVIM:

CCL Length Services Classification (DimVIM)

Managed by: Michael Matus (BEV)

The DimVIM is available for download in a number of languages as given below:

English Andrew Lewis (NPL)
Chinese Weinong Wang (NIM)
Czech Petr Balling and Petr Kren (CMI)
German Ruedi Thalmann (METAS)
Finnish Antti Lassila (MIKES)
French Jose Salgado (LNE)
Greek Christos Bandis (EIM)
Italian Alessandro Balsamo (INRIM)
Japanese Makoto Abe (AIST/NMIJ)
Korean Chu-Shik Kang (KRISS)
Portuguese Fernanda Saraiva (IPQ)
Spanish Emilio Prieto (CEM)
Thai Jariya Buajarern (NIMT)
Turkish Tanfer Yandayan (UME)

  CCL: Upcoming meetings
25–28 October 2021: 18th meeting of the CCL and related meetings

CCL summary
General information
Members of the CCL
Comparison linking
CCL key comparison portfolio
DimVIM: Multilingual CMC classification scheme
CCL publications and bibliography
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