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Poka-yoke was originally baka-yoke, but as this means "fool-proofing" (or "idiot-proofing") the name was changed to the milder poka-yoke. [4] Poka-yoke is derived from poka o yokeru (ポカを避ける), a term in shogi that means avoiding an unthinkably bad move.
Shigeo Shingo: Mistake-Proofing for Operators: The ZQC System, Productivity Press, 1997 (in English), ISBN 1-56327-127-3; Shigeo Shingo: The Shingo Production Management System: Improving Process Functions (Manufacturing & Production), Productivity Press, 1992 (in English), ISBN 0-915299-52-6
Prevention, in the form of "pledging ourselves to make a constant conscious effort to do our jobs right the first time", is the only way to guarantee zero defects. Beyond that, examining the production process for steps where defects can occur and mistake proofing them contributes to defect-free production. [16] [17]
An error-tolerant design (or human-error-tolerant design [1]) is one that does not unduly penalize user or human errors. It is the human equivalent of fault tolerant design that allows equipment to continue functioning in the presence of hardware faults, such as a "limp-in" mode for an automobile electronics unit that would be employed if ...
In mathematics, certain kinds of mistaken proof are often exhibited, and sometimes collected, as illustrations of a concept called mathematical fallacy.There is a distinction between a simple mistake and a mathematical fallacy in a proof, in that a mistake in a proof leads to an invalid proof while in the best-known examples of mathematical fallacies there is some element of concealment or ...
To complete Jidoka, not only is the defect corrected in the product where discovered, but the process is evaluated and changed to remove the possibility of making the same mistake again. One solution to the problems can be to insert a "mistake-proofing" device somewhere in the production line. Such a device is known as poka-yoke.
Perhaps for the same reason, "foolproof" is now a formal term, whereas "idiot-proof" remains informal. Several Murphy's law adages claim that idiot-proof systems cannot be made, for example "Nothing is foolproof to a sufficiently talented fool" and "If you make something idiot-proof, someone will just make a better idiot."
In 1925 Ackermann published a proof that a weak system can prove the consistency of a version of analysis, but von Neumann found an explicit mistake in it a few years later. Gödel's incompleteness theorems showed that it is not possible to prove the consistency of analysis using weaker systems.
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