quality assurance 
noun [mass noun]
The maintenance of a desired level of quality in a service or product, especially by means of attention to every stage of the process of delivery or production.It was intended to perform the specific function of quality control and quality assurance with emphasis on monitoring and policing....
- The device is suited for a variety of material testing tasks in R & D and quality assurance.
- The team of four executive chefs also assists with cross training, consistency and quality assurance.
- three quarters
- threequel
- three-ring circus
- threescore
- three-sided
- Three Sisters
- threesome
- three-star
- Three Stooges
- three strikes
- three-way
- three-wheeler
- Three Wise Men
- thremmatology
- threnodial
- threnodic
- threnodist
- threnody
- threonine
- thresh
- thresher
- thresher shark
- threshing floor
- threshing machine
- threshing sled