Set of decision rules for identifying the presence of special causes.
Notes: - Decision rules may include those relating to measured quantity values inside and outside of control limits in a control chart. They cover runs, trends, cycles, periodicity, concentration of points near the centre line or control limits, unusual spread of points within control limits (large or small dispersion), and relationships among values within subgroups.
- Examples of decision rules and guidelines for the daily interpretation of a control chart are provided by Nordtest.
Source:
PAC, 2021, 93, 997. 'Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)' on page 1031 (https://doi.org/10.1515/pac-2019-0819)