Only with the consent of the buyer can the company obtain certain benefits. To this end, we must not lack, indispensable technology for production and sales, technology to ensure product quality, etc., and correctly and economically produce a management system that satisfies the quality requirements of customers. Therefore, as mentioned above, pursuing the efficiency improvement of all work and the working methods with improved effects, it is necessary to find a more effective new method to solve various problems occurring in the work. Such an activity is called quality management and focuses on "quality management of manufacturing". The business work has a lot in common as mentioned above.