Explain the difference between control limits and

Step 1 of 2

We often hear control limits and specification limits discussed as if they are

interchangeable. But control limits and specification limits are completely different

values and concepts.

Control limits are calculated from process data for a particular control chart. An X-bar

chart and an Individual measurements chart will have different limits.

Specification limits are chosen in numerous ways. They generally apply to the individual

items being measured and appear on histograms, box plots, or probability plots.