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The 8 Control Chart Rules Pattern DescriptionRulesSmall shifts from the average3, 4Trends5Mixtures6Stratifications72 more rows ?

The following rules can be used to properly interpret control charts: Rule 1 ? One point beyond the 3 ? control limit. Rule 2 ? Eight or more points on one side of the centerline without crossing. Rule 3 ? Four out of five points in zone B or beyond. Rule 4 ? Six points or more in a row steadily increasing or decreasing.

Basic Procedure Choose the appropriate control chart for your data. Determine the appropriate time period for collecting and plotting data. Collect data, construct your chart and analyze the data. Look for "out-of-control signals" on the control chart. ... Continue to plot data as they are generated.

All control charts have three basic components: a centerline, usually the mathematical average of all the samples plotted. upper and lower statistical control limits that define the constraints of common cause variations. performance data plotted over time.

Follow these steps to get started: Decide on a time period, typically noted on the X-axis of the control chart, to collect the necessary data and establish your control limits. Collect your data and plot it on the control chart. Calculate the average of your data and add a control line.

Nelson rules RuleDescriptionProblem IndicatedRule 8Eight points in a row exist, but none within 1 standard deviation of the mean, and the points are in both directions from the mean.Jumping from above to below while missing the first standard deviation band is rarely random.7 more rows

List of the eight Nelson Rules for interpreting control charts One point above UCL or below LCL. Two points above/below 2 sigma. ... Four out of five points above/below 1 sigma. Eight points in a row above/below the center line. Six points in a row ascending or descending (trend)