What is poka-yoke?

Poka-yoke is a quality technique of Japanese origin that is used to avoid the appearance of defects in products and processes. By extension, it also defines any mechanism that assists in preventing an error before it arises, such as the system that warns of a weight overload in a lift and stops it from operating, or the device that stops a cash machine from dispensing money until the user has taken back his/her card.

 
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