Poka-Yoke mistake proofing is a technique used to avoid mistakes by design. It’s helpful to prevent inadvertent errors.


Example: Think about the Ikea furniture; when you assemble it, you have different kinds of objects to make it, like iron pins, wooden pins, etc. In this case, each has a different shape, and if you try to fit one in place of the other, they don't work well.

It’s useful when the process easily have mistake. Some cases that can help to fix are:

  • Processing errors;
  • When machines are not correctly configured, or you don’t use the correct tool;
  • Missing parts or improper parts used;
  • Inappropriate dimension of the part used;

The three different kind of poka-yoke that you can use in the design to avoid mistake are:

  • Contact method: the physical characteristic of an object helps you to find the correct position correctly;
  • Fixed-value method: you need to do a fixed value of step in the process if you don’t do that same kind of warnings lights up;
  • Motion-step method: test if all the step of the process are done in the correct order (for example a checklist, or workflow software, etc.);

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