Poka-yoke (ポカヨケ, [poka joke]) is a Japanese term that means "mistake-proofing" or "inadvertent error prevention". The key word in the second translation, often omitted, is "inadvertent". There is no poka-yoke solution that protects against an operator's sabotage, but sabotage is a rare behavior among people.[1] A poka-yoke is any mechanism in any process that helps an equipment operator avoid (yokeru) mistakes (poka). Its purpose is to eliminate product defects by preventing, correcting, or drawing attention to human errors as they occur.[2] The concept was formalised, and the term adopted, by Shigeo Shingo as part of the Toyota Production System.[3][4] It was originally described as baka-yoke, but as this means "fool-proofing" (or "idiot-proofing") the name was changed to the milder poka-yoke.


More broadly, the term can refer to any behavior-shaping constraint designed into a process to prevent incorrect operation by the user.

A simple poka-yoke example is demonstrated when a driver of the car equipped with a manual gearbox must press on the clutch pedal (a process step, therefore a poka-yoke) prior to starting an automobile. The interlock serves to prevent unintended movement of the car. Another example of poka-yoke would be the car equipped with an automatic transmission, which has a switch that requires the car to be in "Park" or "Neutral" before the car can be started (some automatic transmissions require the brake pedal to be depressed as well). These serve as behavior-shaping constraints as the action of "car in Park (or Neutral)" or "foot depressing the clutch/brake pedal" must be performed before the car is allowed to start. The requirement of a depressed brake pedal to shift most of the cars with an automatic transmission from "Park" to any other gear is yet another example of a poka-yoke application. Over time, the driver's behavior is conformed with the requirements by repetition and habit.

Other Languages
العربية: بوكا يوكي
català: Poka-Yoke
čeština: Poka-joke
Deutsch: Poka Yoke
eesti: Poka-yoke
español: Poka-yoke
euskara: Poka-yoke
français: Détrompeur
한국어: 포카 요케
italiano: Poka-yoke
עברית: פוקה-יוקה
ಕನ್ನಡ: ಪೋಕಾಯೋಕೆ
magyar: Pokajoke
Nederlands: Poka yoke
日本語: ポカヨケ
polski: Poka-yoke
português: Poka-Yoke
svenska: Poka-yoke
Türkçe: Poka-Yoke
українська: Захист від дурня
中文: 防呆