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A detailed discussion is presented on the main points of the Convention on the mutual recognition of national standards, calibration certificates, and measurements presented by national metrological institutes, and a survey is given of international collaboration to carry this out. Regional metrological organizations are important, and a survey is presented on work done in COOMET. Brief descriptions are given of ways in which the Convention may develop in the near future. The positive points from the implementation of the Convention are formulated from the author's experience and from research by other experts.