Six Sigma DMAIC Process - Analyze Phase - Control Impact Matrix

The control–impact matrix is a prioritization tool used with the cause-and-effect (C&E) tool, typically after possible causes have been identified. It considers whether a factor is within the team’s control and how strongly it may affect the problem. Prioritization helps choose what to investigate; it does not establish causation by itself.

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Six Sigma Control Impact Matrix

Use a cause-and-effect (C&E) matrix to organize possible factors. Check the qualitative assessment against observations and data, then use the control–impact matrix or Pareto analysis to help prioritize investigation. A rank alone does not establish a root cause; you may need to drill down further.

How do we do it?
Ask “why” repeatedly to develop a plausible causal explanation. Five is a guide, not a mandatory stopping point. Verify the proposed explanation with evidence; reaching an answer—or running out of answers—does not by itself establish a root cause.