– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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BIPM liaison work

The BIPM works in close cooperation with many other international bodies concerned with different aspects of metrology. In a typical year, the BIPM's work with these organizations requires around 355 person days, and might involve 35 instances of travel by BIPM staff.

For more information please contact: Andy Henson, Director of the BIPM's International Liaison and Communication Department.

Institutional links relating to quality infrastructure:

  • ILAC
  • International Laboratory Accreditation Cooperation
  • ISO
  • International Organization for Standardization
  • OIML
  • International Organization of Legal Metrology
  • BIPM-OIML-ILAC-ISO Joint Declaration on Metrological Traceability

  • Other institutional links:

  • CIE
  • International Commission on Illumination
  • IAEA
  • International Atomic Energy Agency
  • National Conference of Standards Laboratories International
  • United Nations Industrial Development Organization
  • Versailles Project on Advanced Materials and Standards
  • WHO
  • World Health Organization
  • WMO
  • World Meteorological Organization
  • WTO Committee on Technical Barriers to Trade

    The BIPM also maintains many links at the technical level (see separate tab above), and:

    Each State has its own metrology infrastructure. In most cases the BIPM interacts principally with one National Metrology Institute (NMI) per State, as nominated through the State's Foreign Affairs Department. That NMI is responsible for coordinating with any other institutes (NMIs or others) that make up that nation's metrology system.

    The BIPM hosts (approximately annual) meetings of the Directors of NMIs, providing a unique occasion for discussion of metrological issues of world-wide concern, and of course for discussion of the BIPM's work programme. Such meetings sometimes also include governmental representatives from Member States, to allow discussion of the financial implications.

    For more information, please see the lists of Member States, and Associates, which also give more information about the NMIs.

    Hubs for BIPM interlocutors:

    A number of Joint Committees of the BIPM and other international organizations have been created for particular tasks of common interest:

  • JCGM
  • Joint Committee for Guides in Metrology
  • JCRB
  • Joint Committee of the Regional Metrology Organizations and the BIPM
  • Joint Committee for Traceability in Laboratory Medicine
  • INetQI
  • International Network on Quality Infrastructure

    The BIPM works closely with the Regional Metrology Organizations (RMOs), both through the JCRB and directly through participation at their General Assemblies and meetings of their technical working groups.

  • Intra-Africa Metrology System
  • APMP
  • Asia Pacific Metrology Programme
  • Euro-Asian Cooperation of National Metrological Institutions
  • European Association of National Metrology Institutes
  • Gulf Association for Metrology
  • SIM
  • Inter-American Metrology System

    BIPM technical liaisons:

    The BIPM Time Department has full responsibility for the maintenance of Coordinated Universal Time (UTC) and for giving traceability to the SI second to local time scales via the key comparison CCTF-K001.UTC. Technical liaisons are established with national and international bodies related with timekeeping, time and frequency metrology, and dissemination.

    Close cooperation has been established with the International Telecommunication Union (ITU), for issues relating to the regulation of standard time and frequency signals. The BIPM is a Sector Member of the Radiocommunication Sector of the ITU (ITU-R), and reciprocally, the ITU-R participates in the Consultative Committee for Time and Frequency.

    In its present definition, UTC is kept close to the Earth's rotation time by the insertion of leap seconds. The International Earth Rotation and Reference Systems (IERS) establishes the dates of introduction of leap seconds, thus providing relevant information to the calculation of UTC at the BIPM.

    Global navigation satellite systems (GNSS) provide an essential tool for international clock comparison. For technical aspects, interaction with the International GNSS Service (IGS) grants the availability of sets of parameters involved in the computation of UTC. The BIPM Time Department has leading actions for providing the interface between GNSS and time metrology users at the UN International Committee for GNSS (IGS).

  • ESA
  • European Space Agency
  • IAG
  • International Association of Geodesy
  • IAU
  • International Astronomical Union
  • ICG
  • International Committee on Global Navigation Satellite Systems
  • IERS
  • International Earth Rotation and Reference Systems
  • IGS
  • International GNSS Service
  • ITU
  • International Telecommunication Union
  • URSI
  • International Union of Radio Science

    BIPM technical liaisons in Electricity, and Acoustics, Ultrasound and Vibration:

  • IEC
  • International Electrotechnical Commission

    BIPM technical liaisons in Mass:

    BIPM technical liaisons in Photometry and Radiometry:

  • CIE
  • International Commission on Illumination
  • WMO
  • World Meteorological Organization

    The BIPM/CIPM has established Memoranda of Understanding with:

  • IAEA
  • IFCC
  • ILAC
  • ITU
  • WHO
  • It also has formal Agreements with:

  • CIE
  • WMO
  • Organization: