The International Bureau of Weights and Measures (BIPM), the International Organization of Legal Metrology (OIML), the International Laboratory Accreditation Cooperation (ILAC) and the International Organization for Standardization (ISO) are four internationally recognized bodies which are responsible for metrology, accreditation and standardization world-wide.

Recognizing the importance of metrologically traceable measurement results to the core missions of these four Organizations, the following joint policy document has been drawn up. We encourage the Members of the four Organizations, as well as others for whom traceability is important, to adopt it. We also encourage other bodies to declare their support for the principles and practices embodied in this Declaration wherever possible.

The document builds on the tripartite statement issued by the BIPM, the OIML and the ILAC on 23 January 2006 on the relevance of various international agreements on metrology to trade, legislation and standardization.

Joint BIPM, OIML, ILAC and ISO declaration on metrological traceability 9 November 2011

Director of the BIPM	Director of the BIML	Chair of ILAC	Secretary General of ISO
Michael Kühne	Stephen Patoray	Peter Unger	Robert Steele