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ISO 9000
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Three of the current standards, ISO 9001, 9002 and 9004, have been used extensively as the basis for independent quality system certification. This has resulted in the certification of around 300,000 organisations, with many more in the process of setting up and implementing quality management systems (QMS).
ISO protocols require that all standards be reviewed at least every five years to determine whether they should be confirmed, revised or withdrawn.