It analyzes and evaluates the production process, finds the symptoms of system factors in time according to the feedback information, and takes measures to eliminate its influence, so as to keep the process in a controlled state only affected by random factors, thus achieving the purpose of quality control.
The basic principles and methods of SPC were put forward by Dr. Shewhart in the 1930s in order to effectively monitor and control the product quality in the production process, and it has a history of more than 70 years. Since its establishment, it has been widely used in industries such as industry and service industry.