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Mistake ProofingMistake Proofing is a process used to design processes so that they cannot make defective parts. Poka-yoke devices are methods, fixtures or techniques used to prevent a defective part from leaving an operation if it is incorrect or incomplete. These are often used as part of a Zero Quality Control (ZQC) program that aims to build quality control into a process to reduce defects to zero. People and machines do make mistakes, parts run out, operations are skipped, holes are drilled in the wrong place, fittings are mounted the wrong way. By designing a process to prevent or flag these problems immediately when they occur, no defects are passed along the production line. Poka-Yoke devices can be as simple as go-no-go gauges that check parts as they are made or alignment pins on a fixture or holding plate to make sure that holes are drilled in the correct fashion.
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