The general criteria
for membership of a Consultative Committee do not apply to the Consultative Committee for Units (CCU), which has a different mission from that of the other Consultative Committees.
In 2009 the CIPM approved the following criteria for membership of the CCU.
- The CCU seeks the active participation of:
- International Unions1, International Commissions or Committees2, and other Intergovernmental Organizations or International Bodies3 which have a specific interest in units and which help to implement the recommendations of the CCU approved by the CIPM;
- up to seven National Metrology Institutes or similar National Institutes4 chosen on the basis of expertise and coverage of a number of the world languages for which the CCU formal documentation is translated; and
- personal members5, who are individuals with a long-term involvement in matters related to units, having actively contributed to publications on units, and having a global view and understanding of science as well as knowledge on the development and functioning of the International System of Units.
- Some experts may be invited as guests on an individual one-off basis in order to report on specific developments of technical and research work related to units under discussion.
- The CCU has no observers.