What is a Control Chart?
A control chart is a graphical way to filter out routine variation in a process. Filtering out routine variation helps manufacturers and other businesses determine whether a process is stable and predictable. If the variation is more than routine, the process can be adjusted to create higher quality output at a lower cost.
All processes exhibit variation as the process is measured over time. There are two types of variation in process measurements:
• Routine or common-cause variation. Even measurements from a stable process exhibit these random ups and downs. When process measurements exhibit only ...