Economic design of acceptance control charts

Acceptance control charts are one of the effective tools for monitoring capable processes, where the fraction of produced non-conforming items is very low. Due to high capability of the process, in these charts, controlled changes in the process mean are allowed. Although acceptance control charts are widely used in practice, it is often designed without considering the economic aspects that would result in economic drawbacks from the process and cause in increasing process costs. In this paper to make the acceptance control charts more applicable, an economic model is presented. In this model, control chart parameters, sample size, sampling interval, and the control limits coefficient are determined such that the expected cost of the process is minimized.