What Control Charts Look Like

 

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What Control Charts Look Like

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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.

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