IASSC® Certified Lean Six Sigma Green Belt™ — Lesson 3: Green Belt Root Causes, Solutions, Experiments, Improvement, and Risk

Learning Objectives

• Explain the roles, information, criteria, dependencies, and decision points governing root-cause analysis and root-cause analysis.
• Implement or assess solution selection, pilot testing, and implementation risk using controlled evidence and acceptance criteria.
• Evaluate the condition where reviewers reach the wrong conclusion because implementation risk evidence conflicts with root-cause analysis context and the baseline was not preserved and select a proportionate corrective response.

Detailed Topics

• root-cause analysis applied to the course scenario, expected behavior, stakeholders, controls, risks, and evidence.
• root-cause analysis applied to the course scenario, expected behavior, stakeholders, controls, risks, and evidence.
• solution selection applied to the course scenario, expected behavior, stakeholders, controls, risks, and evidence.
• pilot testing applied to the course scenario, expected behavior, stakeholders, controls, risks, and evidence.
• implementation risk applied to the course scenario, expected behavior, stakeholders, controls, risks, and evidence.

Instructor Demonstration

The instructor traces an improvement team using Green Belt methods to reduce waste, variation, defects, and process delay while sustaining measurable gains. The walkthrough connects frameworks, processes, tools, decisions, and evidence captured in the Green Belt project charter, process map, analysis workbook, and control plan. It also tests the exception where reviewers reach the wrong conclusion because implementation risk evidence conflicts with root-cause analysis context and the baseline was not preserved.

Hands-On Exercise

Complete a controlled PeopleCert-aligned exercise covering Green Belt Root Causes, Solutions, Experiments, Improvement, and Risk and preserve the verified result in the Green Belt project charter, process map, analysis workbook, and control plan.

1. Confirm scope, roles, criteria, prerequisites, information sources, dependencies, and acceptance conditions.
2. Execute the service, project, portfolio, risk, Lean, or operational workflow while recording decisions and evidence.
3. Test normal behavior, one boundary condition, and the stated exception using a controlled scenario.
4. Document findings, corrections, ownership, retest criteria, communication, and operational handover.

Scenario Analysis

• Identify which role, process, objective, control, information source, or decision most strongly influences root-cause analysis.
• Compare two defensible responses and explain service, project, quality, risk, operational, and business trade-offs.
• Determine how the Green Belt project charter, process map, analysis workbook, and control plan should be approved, retained, reviewed, retested, and updated.

Troubleshooting Guidance

Start where expected behavior first differs from the observed result. Check scope, criteria, ownership, data quality, process sequence, policy alignment, version compatibility, dependencies, status, and evidence separately. Treat “reviewers reach the wrong conclusion because implementation risk evidence conflicts with root-cause analysis context and the baseline was not preserved” as a hypothesis until records, interviews, configurations, calculations, and retest outcomes confirm the cause.

Validation Checklist

• Required roles, processes, criteria, controls, information, approvals, and dependencies are present.
• The Green Belt project charter, process map, analysis workbook, and control plan connects each conclusion to objective, reviewable evidence.
• Normal processing, a boundary condition, dependency behavior, and the stated exception were tested.
• Corrections, ownership, retest criteria, documentation, communication, and operational handover are complete.

Lesson Outcome

Learners can apply Green Belt Root Causes, Solutions, Experiments, Improvement, and Risk, explain the resulting service, project, quality, risk, or operational behavior, and defend the outcome through the Green Belt project charter, process map, analysis workbook, and control plan.