Q1898Poka-yoke mistake-proofing changes a product or process so errors are prevented, made immediately visible or unable to pass to the next step.
A connector shaped so it only fits one way, a machine that will not run without a guard, a tray that exposes a missing part: each moves reliability out of memory and into form. Associated with Shigeo Shingo and Japanese manufacturing, poka-yoke rejects the fantasy of flawless attention. People tire, hurry and improvise. Good systems respect that reality by catching small errors before consequence enlarges them.










