This publication outlines the concepts and models supporting the requirements for understanding organizational competence within the nuclear context. It aims to help in the development of organizational competencies in countries with an existing nuclear power capability and those wishing to embark on a nuclear power programme. The publication summarizes necessary processes for mapping organizational competencies, as well as tools and techniques used for assessing them. Specific information provided in this publication will help organizations to determine competence needs based on strategic/corporate objectives and business processes, and to identify their existing success factors.