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Quality Quandaries: Interpretation of Signals from Runs Rules in Shewhart Control Charts

Summary: The Shewhart control chart, combined with appropriate runs rules, is a common form of statistical process control. Runs rules aid troubleshooting, giving information about the state of the process when it goes out of control. Proper use of a Shewhart control chart requires the quantification of causes and effects of failure. The example of Douwe Egberts, a Dutch tea and coffee manufacturer/distributor, demonstrates how run rules and a Shewhart control chart can be used as an effective statistical process control tool.

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  • Topics:
  • Keywords: Case study, Runs tests, Shewhart control chart, Statistical process control (SPC)
  • Author: Trip, Albert; Does, Ronald J. M. M.
  • Journal: Quality Engineering