Separate flow and waste problems from variation and defect problems, then use evidence to select the right method. Use Lean to expose delay, handoffs, excess WIP, and poor flow. Use Six Sigma and DMAIC when variation, capability, or defect mechanisms require disciplined measurement and statistical analysis. Combine them only around one chartered problem. Do not select a branded method before defining the gap. Weak measurement systems, unclear defect definitions, and local utilization targets can invalidate both approaches. Lean Six Sigma: AI and automation may accelerate analysis, but people remain responsible for safety, quality, interpretation, and approval.
Method matched to problem
Flow and variation together
Controlled gains
Read the problem signature before choosing a method
Separate flow and waste problems from variation and defect problems, then use evidence to select the right method.
Do not select a branded method before defining the gap. Weak measurement systems, unclear defect definitions, and local utilization targets can invalidate both approaches. Lean Six Sigma: Use evidence from the real process and keep source, timestamp, unit, and uncertainty visible.
- customer requirement
- process-flow loss
- variation and defect data
- measurement-system quality
Validate flow, variation, and the measurement system
Lean Six Sigma: Use evidence from the real process and keep source, timestamp, unit, and uncertainty visible. Focus on customer requirement, process-flow loss, variation and defect data, measurement-system quality.
Use Lean to expose delay, handoffs, excess WIP, and poor flow. Use Six Sigma and DMAIC when variation, capability, or defect mechanisms require disciplined measurement and statistical analysis. Combine them only around one chartered problem. Lean Six Sigma: Preserve a baseline and change one important assumption at a time so the team can explain the result.
- customer requirement
- process-flow loss
- variation and defect data
- measurement-system quality
Combine Lean and DMAIC around one charter
Use Lean to expose delay, handoffs, excess WIP, and poor flow. Use Six Sigma and DMAIC when variation, capability, or defect mechanisms require disciplined measurement and statistical analysis. Combine them only around one chartered problem.
Do not select a branded method before defining the gap. Weak measurement systems, unclear defect definitions, and local utilization targets can invalidate both approaches. Lean Six Sigma: Preserve a baseline and change one important assumption at a time so the team can explain the result.
Test customer impact and unintended trade-offs
Lean Six Sigma: Use simulation or a controlled pilot when interactions, queues, failures, mix, or timing could move the effect elsewhere. Use Lean to expose delay, handoffs, excess WIP, and poor flow. Use Six Sigma and DMAIC when variation, capability, or defect mechanisms require disciplined measurement and statistical analysis. Combine them only around one chartered problem.
Do not select a branded method before defining the gap. Weak measurement systems, unclear defect definitions, and local utilization targets can invalidate both approaches.
- Read the problem signature before choosing a method
Separate flow and waste problems from variation and defect problems, then use evidence to select the right method.
- Validate flow, variation, and the measurement system
Lean Six Sigma: Use evidence from the real process and keep source, timestamp, unit, and uncertainty visible.
- Combine Lean and DMAIC around one charter
Use Lean to expose delay, handoffs, excess WIP, and poor flow. Use Six Sigma and DMAIC when variation, capability, or defect mechanisms require disciplined measurement and statistical analysis. Combine them only around one chartered problem.
- Test customer impact and unintended trade-offs
Lean Six Sigma: Use simulation or a controlled pilot when interactions, queues, failures, mix, or timing could move the effect elsewhere.
- Control the gain in daily work
Lean Six Sigma: Assign an owner, review date, response rule, and success measure. Compare the observed result with the prediction and update the standard.
Control the gain in daily work
Lean Six Sigma: Assign an owner, review date, response rule, and success measure. Compare the observed result with the prediction and update the standard.
Lean Six Sigma: AI and automation may accelerate analysis, but people remain responsible for safety, quality, interpretation, and approval. Do not select a branded method before defining the gap. Weak measurement systems, unclear defect definitions, and local utilization targets can invalidate both approaches.
Practical checklist
- Separate flow and waste problems from variation and defect problems, then use evidence to select the right method.
- Lean Six Sigma: Use evidence from the real process and keep source, timestamp, unit, and uncertainty visible.
- Lean Six Sigma: Preserve a baseline and change one important assumption at a time so the team can explain the result.
- Use Lean to expose delay, handoffs, excess WIP, and poor flow. Use Six Sigma and DMAIC when variation, capability, or defect mechanisms require disciplined measurement and statistical analysis. Combine them only around one chartered problem.
- Lean Six Sigma: Use simulation or a controlled pilot when interactions, queues, failures, mix, or timing could move the effect elsewhere.
- Lean Six Sigma: Assign an owner, review date, response rule, and success measure. Compare the observed result with the prediction and update the standard.
- Lean Six Sigma: AI and automation may accelerate analysis, but people remain responsible for safety, quality, interpretation, and approval.
FAQ
Questions before you join
Sources and further reading
Authoritative references used to research and verify this guide.