An unstable process is characterized by variability that is unpredictable and not due to inherent system fluctuations. The NAHQ CPHQ Detailed Content Outline includes the use of quality tools and techniques, such as control charts, to monitor process stability.cdn.nahq.org
If a process exhibits data points outside control limits or shows non-random patterns, it is deemed unstable, indicating that special causes of variation are present and need to be addressed to achieve consistent quality outcomes.
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