Checklist to establish spc system9/23/2023 ![]() ![]() Step 4: Taking Action to Improve the Process The Cpk is the lower of those two numbers. The Cpk for a process is determined by calculating the Cpu and the Cpl.The distance between the upper spec limit (USL) and the lower spec limit (LSL) is called the total tolerance, or T.T.Step 3: Comparing Process Output to the Spec A specification normally consists of the nominal, or ideal, measure for the product and the tolerance, which is the amount of variation acceptable to the customer. Calculate the process mean and process variation for the measured output.Since common process capability calculations are based on a stable, normally distributed process, if the process is not stable, you should not conduct a process capability study. ![]() Make sure the process is stable using the same methods as for setting up a control chart.Step 2: Determining the Process Output To determine the process output, run the process and collect data as you would if you were setting up a control chart. Make sure the measurement system is reliable. ![]()
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