M. Stock is a member of the CPEM Executive Committee.
N. Fletcher and M. Stock are members of the Technical Committee of CPEM 2012.

M. Stock is the contact person for the BIPM liaison with the International Commission on Illumination (CIE). The annual coordination meeting was held on 27 October 2011 at the BIPM. The main topic was the planned collaboration between the CCPR and the CIE on the publication of the new mise en pratique for the photometric units.

M. Stock is the Executive Secretary of the CCEM and the CCPR and a member of several of their working groups. The 26th CCEM meeting was held on 12-13 March 2011 and the next CCPR meeting is being organized for February 2012.

R. Goebel organizes the review of comparison reports and protocols within the CCPR key comparison working group WG-KC.