First edition was published in 1987 and it was based on the requirements of a British standard (BS 5750).
From its first publication this standard has been revised four times – in 1994, 2000, 2008 and, most recently, in 2015. Standards revision is a normal process, meant to keep them relevant for the changes in technology, business environment and international trade.
ISO 9001 is in fact part of a family of standards that also includes ISO 9000 (standard that defines vocabulary, principles and fundamentals of quality management), ISO 9004 (applicable to organizations that want to use quality management in the pursuit of sustainable success), ISO 19011 (a guide for auditing management systems) or ISO/TS 9002 (published in 2016 as guidelines for the implementation of a quality management system).
Starting from the requirements of ISO 9001 other standards have been developed to define quality management requirements for specific industries. Some examples are ISO/TS 16949 (today IATF 16949 for the automotive industry); ISO 13485 (for the manufacture, storage, distribution, installation and service of medical devices); AS 9100 (specific to the aerospace industry) or ISO/TS 29001 (for the oil and gas sector).