Abstract
Mistake-proofing (or poka-yoke) devices are used to insure that conditions for high quality production exist (source inspection) or to provide rapid feedback on defects (self-checks). In this paper, self-checks are shown to be a special case of the np-control chart, not a competing process control method. Existing economic control chart design models are employed to show that managerial actions cannot always make self-checks as cost effective as other np-chart designs. A model of source inspection is analyzed to determine how low inspection costs must be in order for source inspection to be economical.
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