“Quality means doing it right when no one is looking.”
― Henry Ford
The quality of your product or service defines the success measure of your efforts. Now this leads to several questions like - What is ‘quality’? Why it is so important? To get answers to these questions we have to ask ourselves what is the level of standard we would like to achieve? ‘Quality’ is nothing but the final performance criteria which affects a company with respect to its customers, clients or consumers. For each product and service, requirements are specified which are known as ‘Quality Control’ parameters. The article deals with the details of different quality standards.

http://creative.sulekha.com/chapter-22-introduction-to-iso-six-sigma-tqm-lean-manufacturing-cmm-pcmm-cmmi-etc_273495_blog