Comparing methodologies
Lean and Six Sigma are process-based improvement methodologies: both were developed in manufacturing environments, both have proven their effectiveness. Current emerging trends are indicating that integrating the best elements of both methodologies offers a better option.
Comparison of Lean and Six Sigma
Comparison of principles
This table compares the principles of Lean with the principles of Six Sigma.
Methodology |
Lean |
Six Sigma |
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Theory |
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Application guidelines |
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Focus |
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Assumptions |
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Primary effect |
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Secondary effects |
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Criticisms |
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Comparison of toolsets
This table shows a comparison of the commonly used tools of Lean and Six Sigma.
Area |
Lean |
Six Sigma |
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Process mapping |
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Voice of the customer |
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Analysis |
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Process improvement |
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Similarities and differences
This table contrasts the commonly taught approaches to Lean and Six Sigma.
Lean |
Six Sigma |
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Specify Value What is important in the eyes of the customer? |
Define What is important? |
Identify the Value Stream What is the entire Value Stream? |
Measure How are we doing? |
Flow How will the material and information flow through our process? |
Analyse What is wrong? |
Pull How can we let the customer pull products, rather than pushing products? |
Improve What needs to be done? |
Perfect How can we optimise our processes? |
Control How do we sustain the improvements? |