IASSC Certified Lean Six Sigma Black Belt (ICBB) — Question 54

What is the main difference between the concepts of ‘lean’ and ‘Six Sigma’?

Answer options

• A. Lean emphasizes the increase of variance in production systems, whereas ‘Six Sigma’ emphasizes the decrease of variance in production processes.
• B. Lean emphasizes the ‘quality’ factor in production processes, whereas ‘Six Sigma’ emphasizes the ‘time’ factor in production processes.
• C. Lean emphasizes the ‘time’ factor in production systems, whereas ‘Six Sigma’ emphasizes the ‘quality’ factor in production systems.
• D. Lean emphasizes the decrease of variance in production systems, whereas ‘Six Sigma’ emphasizes the increase of variance in production processes.

Correct answer: A

Explanation

The correct answer is A because Lean focuses on increasing efficiency by reducing waste, which can lead to increased variance, while Six Sigma aims to reduce defects and variance in processes. The other options misrepresent the core principles of Lean and Six Sigma, incorrectly attributing the focus on quality and time to the wrong methodologies.