Poka-Yoke

Japanese term meaning 'mistake-proofing' or 'inadvertent error prevention,' originally coined by Shigeo Shingo. Encompasses both mistake-proofing (preventing wrong actions from occurring) and error-proofing (preventing wrong actions from becoming defects). Poka-yoke devices make it impossible or immediately obvious when something is done incorrectly. Examples include fixtures that only accept parts in correct orientation, sensors that detect missing components, or guides that prevent incorrect assembly. Core principle of Jikotei Kanketsu and key element of ADP framework's Prevention level. More effective than relying on operator vigilance or inspection. Used across all problem-solving methodologies to build quality into processes.