Analyze Phase Success Criteria for the DMAIC Improvement Process

June 07th, 2013

Tags: Analyze Phase DMAIC, Six Sigma Analyze, Lean Six Sigma, lean six sigma certifications, Six Sigma Certifications

The DMAIC Improvement Process of Lean Six Sigma comprises five phases namely, Define, Measure, Analyze, Improve, and Control.  The Analyze Phase is where the data collected is analyzed to determine the root causes of the problem(s) being addressed.  We answer the question, “ Which variables in the process make a difference, or not?”  This article outlines the Analyze Phase Objectives, the Tools to Apply, and the Deliverables to be achieved.


  • Develop theories, or hypotheses about the root causes of the process problems
  • Test the hypotheses with data to determine if there is a difference
  • Answer the question,  , “ Which variables in the process make a difference, or not?”
  • Identify and verify the root cause(s) of the process problem(s)

Tools to Use:

  • Brainstorming
  • Affinity Diagrams
  • Tree Diagrams
  • Cause & Effect Fishbone Diagrams
  • Process Control Charts
  • Histograms and Pareto Analysis
  • Data Collection Plans, Sampling Plans, Check Sheets, and Forms
  • Detailed Process Maps with Current State Cycle Times, Yield, Processing Times, and Inventory
  • Process Activity Analysis of Value Add and Non-Value Add
  • Hypothesis Tests
  • Correlation Studies
  • Regression Analysis
  • Design of Experiments

Deliverables that Signify Phase Completion:

  • List of the Potential Causes Identified
  • Criteria used to Narrow the Focus of the Causes for Further Investigation
  • Data and Results from Statistical Analysis used to Verify Root Causes
  • Documentation of how Analyses were Interpreted
  • List of Verified Root Causes and How they Impact the Process

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