Lean needs Six Sigma because: | Six sigma needs Lean because |
Lean cannot explain the role needed to start a project to attain specific results. It identifies waste. | Six Sigma sub-optimizes processes decrease process defect. |
Delivering a collection of tools to know problems and sources of difference. | It improves process speed/cycle time |
Lean does not identify the influence of deviation | It includes methods for continuous improvement (Kaizen) |
Lean is not as strong in the measure and analyze stages of DMAIC | Six Sigma quality is approached faster if lean eliminate non-value-added steps |