The quality inspection stage is characterized by "sampling inspection" of products, so the quality of products cannot be controlled. The characteristic of statistical quality stage is to emphasize the use of management statistics to find out the regularity from the fluctuation of product quality, so as to take effective measures to control all links in the production process in a normal state to ensure quality. In the stage of total quality management, the goal is to provide customers with satisfactory products and best services, with all employees of the organization as the main body and comprehensive use of modern scientific methods.
Quality management refers to all activities that determine the quality policy, objectives and responsibilities in the quality system and realize these objectives and responsibilities through quality planning, control, guarantee and improvement. Quality management and its implementation methods have been introduced into mainstream business education such as EMBA and MBA. Zhu Lan's basic definition of quality management: quality is the management of applicability and marketization.