Poka Yoke: Mistake-Proofingfor
Quality Improvement
• An Overview of Concepts and Applications
• Your Name / Organization
2.
What is PokaYoke?
• • Poka Yoke = Japanese for “mistake-proofing”
or “error prevention”
• • Developed by Shigeo Shingo at Toyota
• • Purpose: Prevent human errors in
manufacturing and service processes
• • Simple, low-cost devices or methods to
avoid mistakes
3.
Why is PokaYoke Important?
• • Reduces defects and rework
• • Improves product and service quality
• • Increases safety and reliability
• • Lowers cost of poor quality
• • Enhances customer satisfaction
4.
Types of PokaYoke
• 1. Warning Poka Yoke → Alerts when an error
is about to happen
• 2. Control Poka Yoke → Prevents the error
from happening
5.
Methods of PokaYoke
• • Contact method: Detects deviations in
shape, size, color
• • Fixed-value method: Ensures correct number
of actions/items
• • Motion-step method: Ensures correct
sequence of steps
6.
Examples of PokaYoke
• • Power plug design to fit only one way
• • Car with automatic warning if headlights left
on
• • Washing machines that stop when the door
is open
• • USB connectors designed for one-way
insertion
7.
Steps to ImplementPoka Yoke
• 1. Identify the problem or error-prone area
• 2. Analyze root causes
• 3. Design a simple mistake-proofing device or
method
• 4. Test and refine the solution
• 5. Train operators and monitor performance
8.
Benefits of PokaYoke
• • Eliminates human error at the source
• • Builds a culture of quality
• • Simplifies training and supervision
• • Supports continuous improvement (Kaizen)
9.
Challenges and Considerations
•• Initial cost and effort to design solutions
• • Risk of overengineering
• • Importance of involving frontline workers
• • Need for regular review and improvement
10.
Summary
• • PokaYoke is a practical, effective tool to
prevent errors
• • Focuses on simplicity and prevention
• • Widely applicable across industries
• • Integral part of Lean Manufacturing and
Quality Management