Video narration
Why should one point beyond a chart's limit get your attention? On your commute, after repeated trips, one unusually slow journey stands out. In manufacturing, repeated component measurements tell a similar story. A Control Chart plots those measurements over time. The CL, or center line, shows the process's typical level. UCL, the upper control limit, and LCL, the lower control limit, show the bounds of expected process variation. Most readings stay between these lines, helping you see how the process behaves over time. But a point above the UCL can signal unusual process behavior. Control limits are not product specifications. That point doesn't prove a defective part or reveal the cause; it directs your attention to the process. Follow PadhoPadaoIndia for more quality engineering. So why give that point attention? It's a reason to investigate-not proof of a defect.