IEC 60300-1:2003 describes the concepts and principles of dependability management systems. It identifies the generic processes in dependability for planning, resource allocation, control, and tailoring necessary to meet dependability objectives. This standard deals with the dependability performance issues in the product life-cycle phases concerning planning, design, measurements, analysis and improvement. Dependability includes availability performance and its influencing factors: reliability performance, maintainability performance, and maintenance support performance. This second edition cancels and replaces the first edition, published in 1993, and constitutes a technical revision. The main changes with respect to the previous edition are: - dependability management system seen as part of the organization's overall management system; - structural and terminological alignment with ISO 9000:2000 standards; - focus on systems. This bilingual version (2013-02) corresponds to the monolingual English version, published in 2003-06. Key words: dependability management systems