When to Use a Box Whisker Chart

The Box Whisker chart may be used to:

Monitor the process location and variation over time.

Compare the location and variation of various processes or categories of products or services.

In any application, Box Whisker Charts are NOT control charts, as they do not have statistical control limits. For that reason, they may not be used to establish statistical control of a process or to measure process capability.

See also:

Interpreting a Box Whisker Chart

Learn more about the Quality Improvement principles and tools for process excellence in Six Sigma Demystified (2011, McGraw-Hill) by Paul Keller, or his online Green Belt certification course ($499).