Following the adoption by the CGPM (2007) of Resolution 12 on the possible redefinition of certain base units of the SI, and in response to the CIPM's request for the Consultative Committees to provide feedback to the CCU, over the last few years many of the Consultative Committees have created special working groups dedicated to considering the implications of the possible future revision of the SI. A list of the principal groups is given below, and links are provided to related Recommendations made by the Committees. For more details the reader is referred to the full reports of the meetings.

CCEM
Recommendation E 1 (2007): "Proposed changes to the International System of Units"
– CCEM Working Group on Electrical Methods to Monitor the Stability of the kilogram (WGKG)
(chair: Dr I.A. Robinson, NPL)
– CCEM Working Group on Proposed Modifications to the SI (WGSI)
(chair: Dr B. Wood, NRC-INMS)

CCM
Recommendation G 1 (2010): Considerations on a new definition of the kilogram
– CCM Working Group on Changes to the SI kilogram (WGSI-kg)
(chair: Dr P. Richard, METAS)
– CCM Working Group on Mass Standards – Task Group 1 on "Mass metrology under vacuum for a mise en pratique"
– CCM Working Group on Mass Standards – Task Group 2 on "Uncertainty components due to traceability to the international prototype of the kilogram"
– CCM Working Group on the Avogadro Constant (WGAv)
(chair: Dr P. Becker, PTB)

CCPR
Photometry, radiometry and the candela: evolution in the classical and quantum world (Metrologia 47 (2010) R15-R32)
– CCPR Working Group on Strategic Planning
(chair: Dr J. Zwinkels, NRC-INMS)

CCQM
Recommendation Q 1 (2009): On the possible redefinition of the mole and the kilogram
– CCQM ad hoc Working Group on the Redefinition of the Mole
(chair: Dr M.J.T. Milton, NPL)

CCT
Recommendation T 2 (2010): Considerations for a new definition of the kelvin
– CCT: Task Group on the SI
(chair: Dr J. Fischer, PTB)