Definition
Jidoka is the principle of “Autonomation”—automation with a human touch. It refers to the practice of designing equipment to detect an abnormal condition (e.g., a defect or a machine failure) and immediately stop the process. This prevents the production of defective goods and allows a single operator to manage multiple machines.
Why It Matters
Automation without oversight is just a faster way to make mistakes. Jidoka ensures that information integrity is maintained at every step; by stopping the line the moment an error occurs, you prevent the propagation of defects and preserve the quality of the entire system.
Core Concepts
- Detection: The machine must have the capability to “sense” when something is wrong.
- Immediate Stop: The process must halt instantly to prevent waste propagation.
- Andon Cord: The human equivalent, where any worker can pull a cord to stop the entire assembly line if they spot a problem.
- Root Cause Analysis: Stopping the line is useless unless it is followed by an investigation into why the failure happened to prevent recurrence.