This is good unless the measurements are in error and are masking a problem.įrom these observations, operators would be expected to make adjustments to the process. The R chart has many low points that indicate little or normal variation. One could state that the process is often out of control. The R chart shows points above the UCL indicating that there is more variation in the process than when the limits were developed. The process average seems to have shifted for extended periods of time. Something has changed since these limits were developed and some attributable causes may need to be corrected. It also shows four points below the LCL, indicating that the process average is too low and requires adjustment upward. The X chart shows 19 points and two runs above the UCL indicating that the process is running too high and needs adjustment downward.
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