How To Use Control Charts for Continuous Improvement
Summary
As the process is running, the samples, of either in-process or finished product, depending on what you are interested in controlling, are randomly obtained and then measured for the required characteristics. As the subgroup measures are entered into the system, a whole lot of calculations are performed and plotted or listed on the Control Chart. Finally, to fully understand SPC and variation, problems are worked through in class to calculate the Control Limits, standard deviation, Cp, and Cpk. As a prerequisite, prospective students should understand how to convert fractions to decimals, how to use a ruler to measure at least to eighths, and how to use basic calculator functions. Shewhart later modified his control scheme to account for other types of non-normal distribution such as time series trends, process shifts and other special causes of variability that did not violate the three sigma rule.
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