Thus by the term quality control we mean the process of control where the management tries to conform the quality of the product in accordance with the pre determined standards and specifications. It is a systematic control of those variables that affect the excellence of the ultimate product.
According to Alford and Beatty " Quality control may be defined as that industrial management technique or group of techniques by means of which products of uniforms acceptable quality are manufactured .
According to Bethel Atwater and Stackman" Quality control refers to the systematic control of those variables encountered in a manufacturing process which affect the excellence of the end product. Such variable results from the application of materials men machines and manufacturing conditions."