This user’s manual provides Member States implementing the IAEA Codes and Safety Guides (NUSS) with practical examples of management organization, good practices, methods and techniques for the maintenance of systems and components important to safety. It contains a detailed description of management systems, administrative controls and procedures for maintenance activities and some aspects of surveillance and verification activities. Contents: Introduction; Scope; Maintenance programme; Implementation of maintenance programme; Surveillance and verification activities; Annex I. Examples of documents; Annex II. Descriptions of practices.