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Poka-Yoke is a term used in Lean Production. It refers to a device that prevents a mistake being made. or makes a mistake immediately obvious.
For example, suppose a nut had to be tightened with a torque spanner, but this could be forgotten and the nut left finger tight only. A fixture could be designed so that the assembly could not be removed until the torque spanner had recorded the correct torque.
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