quality control

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A system for ensuring the maintenance of proper standards in manufactured goods, especially by periodic random inspection of the product.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A control, such as inspection or testing, introduced into an industrial or business process to ensure quality.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun maintenance of standards of quality of manufactured goods