– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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CIPM Task Group for Promotion of the SI
Having completed its mission, this group was closed by the CIPM in March 2019.

It is expected that the CGPM will adopt a substantial redefinition of the International System of Units (SI) in 2018. This will be an important event for the world-wide metrology community. It will require us all to communicate the technical consequences of the proposed changes to the way that traceability will be disseminated to users. It will also provide a special opportunity to increase awareness of the SI, promote metrology in general, and educate the general public about the importance of accurate measurement in daily life.

The Task Group will identify and develop key tools to support all Member States to promote the revised SI among a wide range of different audiences. The Group will share communication tools and messages through this web page. The messages and tools will be available for Member States to use as they find appropriate.

The Group meets annually, with a PR Expert Group undertaking activities between meetings.


  • Prof. Joachim Ullrich


  • Dr Estefanía de Mirandés  (BIPM)


  • BIPM
  • LNE
  • NIM
  • NIST
  • NPL
  • PTB


  • ILAC
  • ISO
  • OIML
  • IEC
  • CIE

PR Expert Group:

  • Mrs Fiona Auty, NPL [rapporteur]
  • Dr Valérie Morazzani, LNE
  • Mrs Gail Porter, NIST
  • Dr Jens Simon, PTB

Photograph of the January 2018 meeting

  CIPM: Upcoming meetings
22–26 February 2021: Online Workshop: The International System of Units (SI) for FAIR digital data
22–26 March 2021: Meetings of the CIPM Sub-Committees and Working Groups

Revision of the SI
Introduction: What, Why and When?
The SI roadmap
FAQs: Frequently Asked Questions about the Revised SI
Discussions on the Revised SI in the Consultative Committees