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QUALITY IMPROVEMENT TOOLS AND TECHNIQUES Statistical Process Control (SPC) Chart 2 Definition : The SPC chart is a run chart with the additional feature of displaying upper and lower statistical control limits for a particular process .These control limits usually represent 3 standard deviations above and below the mean.     Purpose : Look at random variation in a process and whether the process is in control. Determine what the variation means-is it due to common factors or produced by special causes? Assess whether a team has gained more control of a process by reducing variation.     Procedure : Construct chart as for a run chart. Calculate the control limits according to statistical formula or via computer program and plot them on the chart. Examine the data for variation in the process.

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