– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
Search facility:

| Site map | News | Contact us
CCL Sub-Group on Key Comparisons (sWG-KC)

Task description:

  • to coordinate, supervise and support the administrative process of the pilot laboratories in conducting key comparisons;

  • to prepare and maintain guidance documents and templates ready to use for the pilot laboratories;

  • to examine all relevant documents for each key comparison, starting with the protocol and ending with the Draft B report;

  • to advise the pilot laboratory in preparing the text of the entry to Appendix B of the CIPM MRA as required, including the calculation of degrees of equivalence and linking, and to prepare a recommendation on these subjects for approval by the CCL;

  • to prepare guidance documents on identifying significant deviations for use by the pilot laboratories.


  • Prof. Andrew Lewis  (NPL)


  • Mr Majed Al Senaidi (EMI)
  • Mr Andrew Baker (NMIA)
  • Dr Alessandro Balsamo (INRIM)
  • Prof. Karina Beatriz Bastida (INTI)
  • Dr Harald Bosse (PTB)
  • Dr Akiko Hirai (NMIJ/AIST)
  • Mr Oleksandr Kostrikov (NSC IM)
  • Mr Oelof Kruger (NMISA)
  • Prof. Andrew Lewis (NPL)
  • Dr Michael Matus (BEV)
  • Dr Emilio Prieto Esteban (CEM)
  • Dr Miguel Ramón Viliesid Alsonso (CENAM)
  • Ms Xue Zi (NIM)

including the following ex officio members:

  • chairpersons of the RMO technical committees for length
  • chairs of DGs
  • representative for CCL-K1

  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
CCL working groups
Photographs of the CCL
Open documents
CCL documents
WGFS documents
CCL-WG documents