Lean Six Sigma Green Belt Practice Exam — Study Guide
Free, topic-by-topic study notes for the Lean Six Sigma Green Belt Practice Exam exam. Read a chapter, then practice it.
Define
The Define phase frames the improvement project: what problem is being solved, for whom, within what boundaries, and why it matters to the business. Green Belts translate the Voice of the Customer into measurable requirements and secure agreement on scope and goals before any data is collected.
Measure
The Measure phase establishes a reliable baseline of current performance using trustworthy data. Green Belts learn to classify data, compute core defect metrics, and confirm that the measurement system itself is accurate before drawing conclusions.
Analyze
The Analyze phase identifies and verifies the root causes that drive the problem. Green Belts combine graphical exploration with basic statistical tests to separate real signals from noise and to confirm which inputs actually influence the output.
Improve
The Improve phase develops, tests, and implements solutions that address the verified root causes. Green Belts use structured experimentation, Lean flow concepts, and error-proofing to reduce variation and waste.
Control and Lean Fundamentals
The Control phase locks in the gains so improvements do not erode over time, using monitoring, standardization, and clear reaction plans. Lean fundamentals such as waste elimination and 5S support a stable, capable process.
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