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.

Chairperson:

• Dr Marek Smid  (CMI)

Members:

• 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.

CCPR-WG-CMC:

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)