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　　other information necessary for their interpretation, are
　　
　　published by the BIPM and entered into the key comparison
　　
　　database.
　　
　　T.6 CIPM and RMO key comparisons must be carried out followi-ng the Guidelines for CIPM key comparisons published by
　　
　　the BIPM and available on the BIPM Web page.
　　
　　T.7 For calibration and measurement certificates, the quanti-ties, ranges and calibration and measurement capabilities
　　
　　expressed as an uncertainty (normally at a 95% level of
　　
　　confidence but in some cases it may be at a higher, spec-
　　
　　ified, level), are listed for each participating institu-
　　
　　te in Appendix C. They must be consistent with the resul-
　　
　　ts given in Appendix B, derived from the key comparisons.
　　
　　If, as a result of a key comparison, a significant unres-
　　
　　olved deviation from the key comparison reference value
　　
　　persists for the standard of a particular participating
　　
　　institute, the existence of this deviation is noted in A-
　　
　　ppendix C. In this case, the institute has the choice of
　　
　　either withdrawing from Appendix C one or more of the re-
　　
　　levant calibration and measurement services or increasing
　　
　　the corresponding uncertainties given in Appendix C. The
　　
　　calibration and measurement capabilities listed in Appen-
　　
　　dix C are analysed by the Joint Committee following the
　　
　　procedures given in 7.3 above. The calibration and measu-
　　
　　rement capabilities referred to in this paragraph are th-
　　
　　ose that are ordinarily available to the customers of an
　　
　　institute through its calibration and measurement servic-
　　
　　es; they are sometimes referred to as best measurement c-
　　
　　apabilities.
　　
　　T.8 Responsibilities of the Consultative Committees: the Con-sultative Committess have a prime role in choosing and i-
　　
　　mplementing key comparisons and in affirming the validity
　　
　　of the results. THeir particular responsibilities are:
　　
　　a) to identify the key comparisons in each field and mai-
　　
　　ntain a current list (Appendix D);
　　
　　b) to initiate and organize, with the collaboration of t-
　　
　　he BIPM, the execution of key comparisons at intervals
　　
　　to be decided individually for each comparison;
　　
　　c) to review the results of CIPM key comparisons and det-
　　
　　ermine the reference values and degrees of equivalence
　　
　　on the basis of the proposals of the appropriate work-
　　
　　ing groups;
　　
　　d) to approve the final report of CIPM key comparisons f-
　　
　　or publication by the BIPM;
　　
　　e) to examine and confirm the results of RMO key and sup-
　　
　　plementary comparisons and incorporate them in Append-
　　
　　ix B and key comparison database;
　　
　　f) to examine and confirm the results of bilateral key c-
　　
　　omparisons for entry into Appendix B and the key comp-
　　
　　arison database.
　　
　　T.9 RMO key comparisons: the RMO key comparisons extend themetrological equivalence established by the CIPM key com-
　　
　　parisons to a greater number of national metrology insti-
　　
　　tutes including those of States of Economies that are As-
　　
　　sociates of the CGPM. Redundancy, coherence and timeline-
　　
　　ss are important aspects of regional comparisons for they
　　
　　ensure that the overall system of comparisons is robust.
　　
　　Regional organizations therefore have a particular respo-
　　
　　nsibility for ensuring that:
　　
　　a) links with the CIPM key comparisons provide adequate
　　
　　redundancy through the participation of a sufficient
　　
　　number of laboratories in both sets of comparisons to
　　
　　ensure that links to the key comparison reference val-
　　
　　ues are established with acceptably low uncertainty;
　　
　　b) the procedures used in regional comparisons, and the
　　
　　evaluation of the results and uncertainties, are comp-
　　
　　atible with those used in the CIPM key comparisons;
　　
　　c) the timing of the RMO key comparisons is coordinated
　　
　　with, and is at least as frequent as, those of the CI-
　　
　　PM key comparisons;
　　
　　d) the results of RMO key comparisions are carefully eva-
　　
　　luated by the RMO, which also takes responsibility for
　　
　　ensuring that the proper procedures have been followed
　　
　　, and then the results are submitted for publication
　　
　　and to the relevant CC for incorporation in Appendix B
　　
　　and the key comparison database;
　　
　　e) the results of appropriately performed bilateral comp-
　　
　　arisons are considered and then submitted to the rele-
　　
　　vant Consultative Committee for incorporation in Appe-
　　
　　ndix B and the key comparison database;
　　
　　f) in the case that an RMO key comparison takes place be-
　　
　　fore the corresponding CIPM key comparison, the link
　　
　　to the subsequent key comparison reference value is d-
　　
　　eferred until both key comparisons are completed.
　　
　　T.10 supplementary comparisons : in addition to the key compa-risons, the Consultative Committees, the RMOs and the BI-
　　
　　PM may carry out supplementary comparisons to meet speci-
　　
　　fic needs not covered by key comparisons, including comp-
　　
　　arisons to support confidence in calibration and measure-
　　
　　ment certificates.
　　
　　The Joint Committee of the RMOs and the BIPM (see paragr-
　　
　　aph 9.3 above) provides a forum for the coordination, am-
　　
　　ong the regions, of the supplementary comparisons carried
　　
　　out by the RMOs in order to bolster confidence in calibr-

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