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This paper gives an overview of the institutional framework of Quality Infrastructure (QI) with an international perspective. It develops a composite indicator to measure and compare the development and the performance of QI in a selection of 53 different nations worldwide. The indicator uses freely available data: Total Accredited Bodies of the National Quality System, number of Calibration and Measurement Capabilities certifications, ISO 9001 per country, key and supplementary comparisons carried out by National Metrology Institutes, participation in Technical Committees of International Standards Organization and membership of international organizations backing the credibility of the national QI.