The need to produce highly reliable products is essential for the survival of many industries in today’s world. Consequently, one of the main quality characteristics of products is their lifespan or reliability. The production process must be monitored to produce highly reliable products, and in this regard, control charts are one of the widely used process monitoring tools. In this study, the lifetime of the products, which is monitored as a quality characteristic, follows the Weibull distribution with a variable scale parameter and a fixed shape parameter. Monitoring the average lifetime of the products is conducted by examining the Weibull distribution scale parameter. To design a control chart, first, the control limits of the chart for different parameters are obtained and presented. Relationships and values regarding control limits show that the control limit of a one-sided chart is always larger than the control limit of a two-sided chart. For evaluating the performance of the proposed control chart, t
