This IASSC Lean Six Sigma Green Belt – Mastering DMAIC Analyze Phase lesson focuses on one of the most critical stages of process improvement: identifying the true root causes of problems. It is designed for learners preparing for Lean Six Sigma certification and real-world improvement projects.

The Analyze phase is part of Lean Six Sigma and is used to study process data collected during the Measure phase. The goal is to understand why defects or inefficiencies are happening rather than just observing symptoms.

In this lesson, you will learn key root cause analysis tools such as the 5 Whys technique, Fishbone (Ishikawa) diagrams, Pareto analysis, and process mapping. These tools help break down complex problems into manageable causes that can be measured and validated.

You will also understand how data analysis supports decision-making in this phase, helping teams move from assumptions to evidence-based conclusions. Identifying the correct root cause is essential for developing effective solutions in the Improve phase.

By the end of this guide, you will have a clear understanding of how to apply the Analyze phase in DMAIC and use structured problem-solving tec