Abstract
The accreditation of laboratories for carrying out calibration and testing is increasingly recognized internationally as an effective means of raising the quality of performance of such laboratories and, through the medium of accreditation standards, a means of international intercomparison of testing and calibration competence. The majority of developed countries have established national accreditation services and many others are in the throes of setting them up. In the United Kingdom the National Measurement Accreditation Service (NAMAS) was established in 1985 by the amalgamation of the National Testing Laboratory Accreditation Service set up in 1981, and the British Calibration Service set up in 1966. To date, NAMAS has handled some 1500 accreditations. This experience, long and extensive by international standards, has put NAMAS in a pre-eminent position in the international league and the NAMAS practices have been used as a model by many other accreditation services.
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