Optimization design of control chart systems

This article proposes an algorithm to design an integrated control chart system consisting of several individual control charts, each of which is used to monitor a critical process stage in the manufacture of a product. The design algorithm considers all the charts within a system in an integrative and optimal manner. Consequently, the performance characteristics of the system as a whole can be significantly improved and the product quality will be further enhanced. Such an improvement is achieved without requiring additional cost and effort for on-line inspections. Furthermore, the floor operators can utilize and understand the optimal control chart system as easily as they do the existing system. Some useful guidelines have also been highlighted to aid the users to adjust the control limits of the control charts in a system.