This edition deals with standardization and certification issues of general industry interest. The book sets out the fundamental provisions of the state standardization system, provides general technical norms, rules and requirements for groups of homogeneous engineering products. A separate section of the publication is devoted to the problems of standardization and interchangeability, a system of tolerances and landings is given, including for various types of connections, gears, plastic products. Particular attention is paid to the assignment of tolerances for the size and location of the surfaces of product parts based on the methods of dimensional chains . The methods of calculation of linear, angular and vector dimensional chains. are presented. This edition contains ISO 9000 series standards for quality management .