ARL

ARL stands for "Average Run Length," a statistical measure used in quality control and monitoring processes. It indicates the average number of samples or observations taken before a signal suggests that a process is out of control or needs investigation. A longer ARL means that more data can be collected before detecting a potential issue, while a shorter ARL allows for quicker response times, helping organizations maintain product quality. Essentially, it balances the need for thoroughness in monitoring with the importance of timely intervention to prevent defects or problems.