The IASSC Lean Six Sigma Green Belt exam is organised around the five DMAIC phases. Rather than headline percentage weights, learn the tools by phase. The statistics concentrate in Measure and Analyze, which is where most candidates lose marks. Confirm the current body of knowledge on the IASSC certification page.
| Phase | What it covers |
|---|---|
| Define | Project selection, voice of the customer, CTQs, problem statement, project charter |
| Measure | Process mapping, data types, measurement systems, basic statistics, process capability |
| Analyze | Root-cause analysis, hypothesis testing, correlation, regression basics |
| Improve | Generating, piloting and implementing improvements |
| Control | Control plans, statistical process control (SPC), sustaining the gains |
How to study it
Learn each tool in the context of its DMAIC phase, so you know when to use it, not just what it is. Put extra time into the Measure and Analyze statistics - data types, capability, hypothesis testing - because they are heavily represented and easy to under-prepare. Remember there are several Six Sigma bodies (IASSC, ASQ and others); study the IASSC body of knowledge if you are taking this route. Confirm the current curriculum on the IASSC certification page.