Statistical process control charts: Part 2 A. display the measurements on every item being produced. B. indicate to the process operator the average outgoing quality of each lot. C. indicate to the operator the true quality of material leaving the process. D. display upper and lower limits for process variables or attributes and signal when a process is no longer in control. E. are a graphic way of classifying problems by their level of importance, often referred to as the 80-20 rule