Abstract

In this article, a new control chart to monitor compound fraction defectives for an un-stabilized production process is developed. The mean and variance of truncated compound distribution are derived and utilized to develop the control limits. In an un-stabilized process, nonconformities exist largely and the process may lead to out-of-control. Hence, appropriate control chart is to be developed for un-stabilized quality circumstances. The newly developed chart has good advantages over other charts by maintaining a single chart by compounding two variable characteristics. This chart can monitor and control the fraction defectives in a production process and at the same time will control the variability in the sample sizes. The efficiency of Control Charts is measured through ARL values and is compared with other charts. It is found that the ARL of the proposed control chart gives better performance over other control charts during a lack of stability in the production process.