Zontec Product Manager Jeff DePuy is the featured "Quality Scan" columnist in the May 2009 issue of Manufacturing Engineering Magazine published by the Society of Manufacturing Engineers.

"SPC software programs should provide four ways to calculate control limits," the article explains. The correct one to use depends on guidance from process engineers or the customer. The four methods are: Estimated Sigma, Calculated Sigma, Calculated Target and User-defined Limits.

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