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;

to agree on detailed technical review criteria;

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

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

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

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