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

  • to advise the pilot laboratory in preparing a comparison status document, and to prepare a recommendation for this summary for the CCL.


  • Prof. Andrew Lewis  (NPL)


  • Mr Majed AlSenaidi (EMI)
  • Mr Andrew Baker (NMIA)
  • Dr Alessandro Balsamo (INRIM)
  • Prof. Karina Beatriz Bastida (INTI)
  • Dr Harald Bosse (PTB)
  • Dr Jariya Buajarern (NIMT)
  • Mr Oelof Kruger (NMISA)
  • Prof. Andrew Lewis (NPL)
  • Dr Michael Matus (BEV)
  • Dr Emilio Prieto Esteban (CEM)
  • Dr Miguel Ramón Viliesid Alsonso (CENAM)

  CCL: Upcoming meetings
11–15 June 2018: 17th meeting of the CCL and related meetings

CCL summary
General information
Members of the CCL
CCL key comparison portfolio
DimVIM: Multilingual CMC classification scheme
CCL publications and bibliography
CCL working groups
Key comparisons
Photographs of the CCL
Open documents
CCL documents
WGFS documents
CCL-WG documents