Working Group Members

CCU Task Group on angle and dimensionless quantities in the SI Brochure (CCU-TG-ADQSIB)


Dr Richard J.C. Brown

National Physical Laboratory

United Kingdom

Executive Secretary

Dr Michael Stock

Director of the Physical Metrology Department

Bureau international des poids et mesures


List of meetings

Meetings and related documents

ccu-tg-adqsib TOR

Terms of reference

Acknowledging the current status of angle within the SI Brochure as not being a base unit (Section 2.3.3), the Task Group will:

  • review the 9th Edition of the SI Brochure and highlight the parts (text, tables, footnotes, etc) relevant to angle and dimensionless quantities;
  • decide whether the parts identified could be improved to aid understanding;
  • attempt to reach consensus on updated entries for those parts where improvement would be beneficial;
  • consider whether a new, additional Appendix to the SI Brochure would be useful to explain more fully the special considerations for angle and dimensionless quantities;
  • review the historical use of SI supplementary units and consider whether reintroduction would be of benefit (for the units radians, steradians and one);
  • present the outcomes in the form of a short report and list of proposals to the next CCU meeting and also provide progress updates to the CCU Working Group on Strategy.

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