2) The second edition: ISO 900 1: 1994 (first revision/tactical revision) follows the concept of quality assurance, and the brand of traditional manufacturing industry is still obvious.

3) The third edition: ISO900 1:2000: 2000 (the second revision/strategic revision) introduces the concepts of "focusing on customers" and "process method" to realize the sublimation from quality assurance to quality management from a systematic perspective.

4) The fourth edition: ISO900 1:2008: 2008 (the third revision/technical revision) was edited, with no major changes.

5) Fifth Edition: ISO 900 1: 20 15 (fourth revision/milestone version change). This version of the standard has changed greatly in terms of structure, vision, compatibility, applicability and ease of use, and at the same time, it quotes some latest management concepts/requirements (such as risk management and knowledge management).