Control charts in a multi product environment: An application study

Abstract: In this article an SPC case study is presented. It consists of monitoring a manufacturing process used for different products of similar kind. So far, each of these products is monitored individually. However, if there is e.g. a quality problem with one joint component, this signal will be distributed over different control charts. Therefor a standardization is introduced, similar to short run SPC methods. Then control chart methods are applied to detect process deviations. If there are observations out of control, a next step is taken and process information are analysed in order to derive possible root causes.