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CCU: Consultative Committee for Units
Special issue on
International determination of the Avogadro constant

CCU summary
General information
CCU strategy
CCU members
CCU working group
Criteria for membership of the CCU
CCU publications
Presentation by Prof. Mills at the 24th meeting of the CGPM
Photographs of the CCU
Open access
SI brochure (8th edn)
Draft Chapters 1, 2 and 3 of the 9th edition of the SI brochure (dated Dec. 2013)

  Working documents
CCU working documents
Direct access
in French: Comité consultatif des unités
The CCU was set up in 1964, to replace the "Commission for the System of Units", set up by the CIPM in 1954.

Present activities concern matters related to the development of the International System of Units (SI), preparation of successive editions of the SI brochure, and advice to the CIPM on matters concerning units of measurement.
Prof. J. Ullrich
President of the PTB 
Physikalisch-Technische Bundesanstalt 
Bundesallee 100 
D-38116  Braunschweig 
Executive Secretary:
Dr C. Thomas
Bureau International des Poids et Mesures 
Pavillon de Breteuil 
92312  Sèvres Cedex 

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CCU strategy

On the possible future revision of the International System of Units, the SI
Resolution 1 of the CGPM (2011)

  Criteria for membership of the CCU
Rules of procedure for the CCs and their WGs
Directory of Consultative Committees