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What Do Control Charts Look Like?
All control charts have four major
sections:
Information section
Data section
Graph section
Comments section
An area of the control chart that is often
overlooked is the Comments section.
If your process has gone
out-of-control, the notes in this section will give you clues as
to why the process went out-of-control.
All control chart
graphs have a centerline and upper and lower control limits.
The centerline represents the process mean, or grand average,
for the process.
The upper and lower control limits show the
extents of the common cause variation in the process. They
approximate plus and minus three standard deviations from the
process mean.
