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[en] The International Atomic Energy Agency (IAEA) promotes industrial applications of non-destructive testing (NDT) technology. NDT technology contributes significantly to the protection of life, public health and the environment through assurance of the quality and integrity of safety-critical equipment and facilities. It is especially important in the developing Member states of the IAEA in many regions where the consequences of failure may be particularly severe with health, political, social, financial and environmental impacts. The IAEA is the only international organization having in its regular program, a continuous and effective transfer of NDT technology to developing countries. These efforts have led to a stage of maturity and self-sufficiency in many countries, especially in the field of training and certification of personnel, and in the provision of services to industries. This has had a positive impact on the improvement of the quality of life and the environment. Non-destructive testing (NDT) methods are used for detection, location and sizing of surface and internal defects (in welds, castings, forging, composite materials, concrete and many more). Various NDT methods are also used in preventive maintenance (e.g. in nuclear, aviation (aircraft), bridges, pipelines). NDT methods are essential to the inspection of raw materials and half-finished products. They are applied to finished products and to in-service inspection as well as for the design and development of new products and for plant life assessment studies. Establishment of an accredited national certification body and a quality management system (QMS) to support its activities is an important task for the NDT providers, training Centres and certification bodies. Such a system provides evidence of the technical competence of certification bodies leading to better management, harmonization of practices, worldwide recognition and competitiveness. This new enhanced document provides guidance to member states for the development quality management system for national certification schemes that comply with ISO/IEC 17024:2012 for the training and certification of NDT personnel to the new ISO 9712:2012. This document describes the principles and practical aspects of implementing a national scheme for the certification of NDT personnel. It is important that the member states realize that this document is a guide to the steps toward implementing such a national scheme in the region and internationally. The main contribution of this publication is the introduction of the best available methodologies on QMS to establish national NDT certification schemes in based on ISO 9712:2012 and complying with ISO/IEC 17024:2012, with the aim of carrying it through to a stage of self-sufficiency, sustainability and international recognition.