What is 'poka-yoke' in Lean methodology?

• A. A scheduling technique for staff assignments
• B. A system designed to prevent errors by designing processes to eliminate mistakes
• C. A tool for calculating return on investment
• D. A method for categorizing customer complaints

Answer: (B)

Poka-yoke is a concept in Lean methodology that focuses on designing processes in a way that prevents errors from occurring. The term translates to "mistake-proofing" or "error-proofing" in Japanese. This approach is essential in Lean because it aims to enhance quality and efficiency by making it difficult or impossible for mistakes to happen during manufacturing or service processes.

By implementing poka-yoke systems, organizations can incorporate mechanisms or devices that either help avoid human error or immediately identify when errors occur, allowing for timely corrections. Examples include using color-coded parts so that incorrect assembly is minimized or design features that ensure the right part can only fit in the right way.

This proactive strategy not only improves the overall quality of the process but also reduces waste, rework, and the costs associated with errors, aligning perfectly with Lean principles that aim to streamline operations and enhance customer satisfaction. Other answer choices do not pertain to the core focus of mistake-proofing, making them less relevant in the context of Lean methodology.