A control chart consists of several parts. It has two control limits and an average line. The bottom dashed line is called ...

On a Shewhart chart, upper and lower control limits are used to decide whether a point signals an out-of-control condition. On a cusum chart, the limits take the form of a decision interval or a ...

The Shewhart chart is named after Walter ... The concepts underlying the control chart are that the natural variability in any manufacturing process can be quantified with a set of control limits and ...