Mistake-Proofing

Prevention approach that eliminates the possibility of making an incorrect action in the first place. Focuses on stopping the wrong human action before it occurs. Examples include fixtures designed so parts can only be loaded correctly, connectors with unique shapes that prevent wrong connections, or physical barriers that make incorrect actions impossible. Different from error-proofing which prevents wrong actions from becoming defects. Part of poka-yoke concept. Represents the Prevention level in ADP framework—strongest form of countermeasure because the mistake cannot physically happen. More reliable than training or procedures which depend on human consistency.