– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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Key Comparisons Working Group (CCRI-KCWG(III))

Chairman: Dr Vincent Gressier (LNE-IRSN)

BIPM contact: Dr Steven Judge (BIPM)


    The purpose of the KCWG(III) is to support and aid the CCRI(III) and BIPM in meeting obligations arising from the CIPM Mutual Recognition Arrangement, and to identify areas of neutron metrology that require further attention in the pursuit of improved standards, key comparison reference values and degrees of equivalence.

    The KCWG(III) provides on-going support to the CCRI(III) and the BIPM in evaluating approaches for comparisons in neutron metrology, guidance in types of comparisons that may support laboratories' claims on measurement capabilities, and providing advice to both the BIPM and the CCRI(III) on the reports and results arising from CCRI and RMO comparisons.

CCRI summary
General information
Members of the CCRI
CCRI publications
International Reference System (SIR)
Open access
CCRI(I) documents
CCRI(II) documents
CCRI(III) documents