Poka-Yoke — Mistake-Proofing in Manufacturing
Poka-yoke (ポカヨケ) is a Japanese term meaning 'mistake-proofing' — designing processes, tools, or fixtures that prevent errors from occurring or immediately detect them when they do. Developed by Shigeo Shingo as part of the Toyota Production System, poka-yoke devices range from simple physical guides (a part that only fits one way) to sensor-based detection systems. The goal is zero defects through prevention, not inspection.
How to Create
Video analysis with Yamazo Studio helps identify where poka-yoke is needed. Record operators performing tasks and analyze for error-prone steps — moments of hesitation, incorrect sequences, or quality checks that rely on human judgment. Once identified, design poka-yoke solutions (physical guides, sensors, checklists) and verify their effectiveness by recording and analyzing the improved process.
Example
Video analysis of a connector assembly operation revealed that operators occasionally installed a gasket upside-down — a defect caught only at final test. A simple asymmetric fixture (poka-yoke) was designed that only accepted the gasket in the correct orientation. Post-implementation video analysis confirmed zero orientation defects.
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