Quality control may be defined as

Source, in full

An effective system for coordinating the quality maintenance and quality improvement efforts of the various groups in an organization so as to enable production at the most economical levels which allow for full customer satisfaction.

Notes from Wikiquote

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More quotes by Armand V. Feigenbaum

Product quality can then be defined as: The composite product characteristics of engineering and manufacturing that determine the degree to which the product, in use, will meet the expectations of the customer.

In the phrase, "quality control" the word control represents a management tool with four steps

Product and service quality can be defined as the total composite product and service characteristics of marketing, engineering, manufacturing, and maintenance through which the product and service in use will meet the expectations of the customer.

In the phrase "quality control" the word quality does not have the popular meaning of "best" in any absolute sense. It means "best for certain customer conditions." These conditions are (a) the actual use and (b) the selling price of the product. Product quality cannot be thought of apart from product cost.

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Attribution

Quote text and notes from Wikiquote: Armand V. Feigenbaum (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.