Control chart system with independent quality characteristics

This article proposes an algorithm to design a control chart system consisting of several individual control charts, each of which monitors one of s critical quality characteristics (dimensions) x(i) of a product. All of the characteristics x(i) are assumed to be independent of each other. The algorithm designs all the charts within a system in an integrative and optimal manner. Consequently, the performance characteristics of the overall system as a whole can be considerably improved and the product quality will be further enhanced. Such improvement is achieved with minimum additional cost and effort. Furthermore, the floor operators can utilize and understand the optimal control chart system as easily as the conventional system. Some useful guidelines have also been brought forth to aid the users in adjusting the control limits of the control charts in a system.