History of Poka-YokeOrigins of the Term: Poka-Yoke. The term “Poka-Yoke” was coined by Shigeo Shingo, a key contributor to the Toyota Production System (TPS); in the 1960s. Shingo noticed that in one process at the Toyota plant the workers often forgot to place a required spring under a switch button. He redesigned the process to be completed i