A set of five international quality standards developed by the International Organization of Standardization and adopted by countries around the world to help companies document their quality systems and maintain efficient quality management systems. Includes ISO 9000 – Quality Management and Quality Assurance Standards: Guidelines for Selection and use; ISO 9001 – Quality Systems: Model for Quality Assurance in Design/Development, Production, Installation, and Servicing; ISO 9002- Quality Systems: Model for Quality Assurance in Products and Installation; ISO 9003 – Quality Systems: Model for Quality Assurance in Final Inspection and Test; ISO 9004 – Quality Management and Quality System Elements – Guidelines