This International Standard provides guidance to auditors and organizations needing to conduct internal and external quality or environmental management system audits, as well as on managing audit programmes. Other possible users of this International Standard include organizations involved in auditor certification and training, accreditation and standardization in the area of conformity assessment. Although this International Standard applies to quality and environmental management system audits, the user may consider extending or adapting the guidance provided herein to apply to other types of audits, including other management system audits.