The use of certain inspection and testing methods and inspection methods to determine the quality characteristics of the product, and the results of the measurement with the specified quality standards for comparison, so that the product or a batch of products to make a qualified or unqualified judgment of quality management methods. Its purpose is to ensure that unqualified raw materials are not put into production, unqualified parts are not transferred to the next process, unqualified products are not shipped; and to collect and accumulate data and information reflecting the quality situation, to provide information for the determination and analysis of process capability, supervision of the process and improvement of quality.
