ISO 8402 deals with standardization of quality vocabulary. ISO 9000 is actually a series of guidelines for selection and use of the appropriate systems standards of ISO 9001 , ISO 9002 Is or 9003. Thus ISO 9000 is the road map to the entire series. ISO 9004 helps building up a quality systems that can fit to a specific situation. It offers guidelines for interpreting the elements required in ISO 9001 Is or 9002 Is or 9003. There are 20 chapters in ISO 9004, viz,

1. Scope and field of application,
2. References,
3. Definitions,
4. Management responsibility,
5. Quality system principles ( structure of the quality systems documentation and auditing of the quality systems,)
6. Economics ( quality related cost considerations,
7. Quality in marketing ,
8. Quality in specification and design,
9. Quality in procurement,
10. Quality in production ( process control),
11. Control of production,
12. Product verification ( inspection and testing),
13. Control of measuring and test equipment,
14. Non conformity ( control of non confirming product,
15. Corrective action,
16. Handling and post production actions ( storage packing delivery and after sales service,)
17. Quality documentation and records,
18. Personnel ( training ) ,
19. Product safety and liability, and
20. Statistical methods,

After a company adopts ISO 9000 an independent official certifying body will assess the company. The assessor will check whether the company desirous of the certification, has covered the basic quality elements pertaining to its industry business and customers. The firm then gets certified to ISO 9000, ISO 9002, or ISO 9003.