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The difference between Six Sigma and Lean Six Sigma

Both methodologies focus on improving processes and increasing efficiency. But they have different approaches and goals. Let's look at the main differences between the two methodologies.

What is Six Sigma?

Six Sigma is a methodology focused on reducing variability and errors in processes. The main goal is to achieve almost perfect quality. It uses data to identify and eliminate the causes of defects and errors. This methodology was developed by Motorola in the 1980s.

Key elements of Six Sigma

  • DMAIC methodology (Define, Measure, Analyze, Improve, Control) = a structured approach is used to improve existing processes
  • Statistical tools = SPC (Statistical Process Control), control charts, regression analysis, hypothesis testing and more
  • Error reduction and process improvement => maximum quality

You can read more about Six Sigma in the article Six Sigma method and its benefits.

What is Lean Six Sigma?

Lean Six Sigma combines the principles of Lean Management and Six Sigma to create a comprehensive approach to process improvement. While Six Sigma focuses on reducing variability and defects, Lean focuses on eliminating waste.

Key elements of Six Sigma

  • DMAIC + Lean = Lean tools and techniques are integrated into each phase of the DMAIC methodology
  • Statistical tools = 5S, Kaizen and Kanban to improve flow and reduce non-value-added activities
  • Integrated approach = combines tools and techniques from both Lean (elimination of waste) and Six Sigma (reduction of variability and defects)

The main differences between Six Sigma and Lean Six Sigma

The difference between Six Sigma and Lean Six Sigma

Which methodology to choose?

The choice between Six Sigma and Lean Six Sigma depends on the specific needs of your organization. If your primary goal is to reduce variability and increase quality through statistical analysis, Six Sigma may be a better choice. If you are trying to improve overall process efficiency, reduce waste while improving quality, Lean Six Sigma may be the ideal solution.

Regardless of which methodology you choose, both approaches can make a significant contribution to improving your organization's performance. Investing in training and certification in these methodologies can pay off in the form of better product quality, higher process efficiency and more satisfied customers.


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