As you will have probably already noticed, the effectiveness of a combined approach takes improvements to dramatically different levels. Lean and Six Sigma complement each other perfectly. Six Sigma not only scores in areas that require reduction in variation and the removal of defects but also cultivates a robust culture to drive sustained organizational improvements. Lean, on the other hand, is very effective at increasing the efficiency and speed of a process. Combined, the Lean Six Sigma approach enjoys the strengths of both methodologies, while overcoming their respective disadvantages. Lean Six Sigma is undoubtedly the most effective and proven improvement methodology in recent times.