The term quality control consists of two words Quality and control Quality is that characteristics or a combination of characteristics that distinguishes one article from the other or goods or one manufacturing from that of competitors or one grade of product from another when both are the outcome of the same factory. The main characteristics that determine the quality of an article may include such elements as design size materials chemical composition mechanical functioning electrical properties workmanship finish and appearance.

Control may be referred to as the comparison of the actual results ( finished product ) with the predetermined standards and specifications. It locates the deviations and tries to remove them. Control is the correction in the quality of the produce when deviations in the quality are more than expected in the process.