There are several approaches to checking for errors. In this article, I’ll discuss three common ways to check for process errors: Successive Check, Self Check, and Poka-Yoke (mistake proof).
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Below is a table that describes the three common strategies for checking errors and I also describe the positive and negative or each approach.
Of course, the approach of Lean Manufacturing is to employ Poka-Yoke wherever possible, as it is the most low cost and low effort approach to achieving zero defects. But, as in some things, it depends on your operation.
|Successive Checks||Self Check||Mistake Proof (Poka-Yoke)|
|Associates check workof previous associate||Associates check own work beforepassing to the next associate||Automatic check and prevention of defect|
|Plus: Generally effective in catching defects||Plus: Instant correction possible and more palatable than supervisor check or peer check||Plus: 100% inspection usually with no extra time expense with the benefit of instant correction|
|Corrective action can only occur after defect is made||Associate may compromise quality or forget to perform self-check||None|