QA (Quality Assurance) - a formal system that has been developed to improve the quality of a product.

QFD (Quality Functional Deployment) - a matrix based method that focuses the designers on the significant design problems.

quality - a measure of how well a product meets its specifications. Keep in mind that a product that exceeds its specifications may not be higher quality.

quality circles - a team from all levels of a company that meets to discuss quality improvement. Each members is expected to bring their own perspective to the meeting.