When online quality engineering is applied to a production line, since the customer's profit is considered and losses that do not show up in the account books are optimized, reductions in accounted costs and defect rates, which are the conventional indicators, are obtained as corporate profits. The application of online quality control necessarily entails taking the point of view of the customer and the market, which is shown to affect finances in the end. In the process of making the total application of online quality engineering in large numbers of manufacturing processes into a strategic goal, important factors for success have become visible, such as the definition of a system that is not affected by the opinions of managers and team leaders. Problems related to the behavior of people in execution (issuing instructions, and providing education and motivation), which is one of the functions of management, have also been clarified. Results have included the appearance of lines that were like the model lines that preceded them in that some lines are free of worker defects and some are not.
