Overall coordination of activities related to this arrangement resides with the CIPM.
Coordination of the key comparisons is effected through consultations between the Consultative Committees and the RMOs.
Coordination of the supplementary comparisons and other actions related to confidence in calibration and measurement certificates undertaken by the regional metrology organizations is carried out by the JCRB. The JCRB is created by the CIPM comprising representatives of the RMOs and is chaired by the Director of the BIPM. Its terms of reference are given in Appendix E.
Under the overall responsibility of the CIPM, the Joint Committee is responsible for analysing and maintaining the content of Appendix C.
At its 92nd meeting, in October 2003, the CIPM approved proposals from the JCRB for modifications to the Technical Supplement of the CIPM MRA. These concern paragraph T.7, stating that unresolved inconsistencies resulting from supplementary comparisons will be noted in Appendix C, and paragraph T.10, clarifying that supplementary comparisons are only carried out by RMOs.