Mistake-Proofing and Measurement Control Charts

Abstract

Shigeo Shingo criticizes statistical process control (SPC) and recommends using mistake-proofing (poka-yoke) devices instead for controlling processes. In this article, the authors demonstrate that Shingo's process control techniques—self-checks and successive checks—are inferior to SPC measurement control charts. The authors also indicate how source inspection, another mistake-proofing technique, can be used in conjunction with SPC to improve quality and manage the variance of process measurements.

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