Lean Six Sigma Exam
DMAIC Framework Practice Questions
120 practice questions with detailed explanations — aligned to the Lean Six Sigma Exam.
Master DMAIC Framework to boost your score on the Lean Six Sigma Exam. Each question below mirrors the style and difficulty of real exam questions, complete with detailed explanations so you understand the why behind every answer. Work through all 120 questions, review any that trip you up, and use the related topics below to round out your preparation.
Q1.Which phase of DMAIC focuses on identifying and verifying root causes of a defect?
A.DefineB.MeasureC.AnalyseD.ImproveC. AnalyseExplanation: The Analyse phase uses statistical and qualitative tools (fishbone diagrams, 5 Whys, hypothesis testing, regression) to identify and verify root causes. You don't move to Improve until root causes are confirmed with data.
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Q2.A Voice of the Customer (VOC) exercise is performed during which DMAIC phase?
A.MeasureB.AnalyseC.DefineD.ControlC. DefineExplanation: VOC is gathered in the Define phase to understand customer requirements and translate them into Critical-to-Quality (CTQ) characteristics. The Define phase establishes the project scope, problem statement, and what the customer values.
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Q3.What is the primary deliverable of the Measure phase?
A.A validated root cause listB.A process baseline (baseline sigma level)C.An implemented solutionD.A control chart with control limitsB. A process baseline (baseline sigma level)Explanation: The Measure phase establishes the current process baseline — including defect rate, process capability (Cpk), and baseline sigma level. You also validate the measurement system (MSA/Gauge R&R) to ensure data is reliable before drawing conclusions.
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Q4.During the Control phase, which tool is used to sustain process improvements and prevent backsliding?
A.SIPOC diagramB.Control planC.Cause-and-effect matrixD.Value stream mapB. Control planExplanation: A control plan documents how the improved process will be monitored and controlled ongoing. It specifies control charts, sampling plans, reaction plans, and who is responsible for each control point. It is handed off to the process owner at project close.
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Q5.What does a SIPOC diagram capture?
A.Sigma, Improvement, Process, Output, ControlB.Suppliers, Inputs, Process, Outputs, CustomersC.Statistical, Iterative, Process, Optimization, ControlD.Scope, Issues, Problems, Objectives, CustomersB. Suppliers, Inputs, Process, Outputs, CustomersExplanation: SIPOC (Suppliers, Inputs, Process, Outputs, Customers) is a high-level process map created in the Define phase to establish scope and identify all stakeholders. It provides a bird's-eye view before diving into detailed process mapping.
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Q6.In the Improve phase, which tool is used to run controlled experiments to identify the optimal combination of input variable settings?
A.Fishbone diagramB.Design of Experiments (DOE)C.Pareto chartD.FMEAB. Design of Experiments (DOE)Explanation: Design of Experiments (DOE) allows the team to systematically vary multiple input factors simultaneously and measure their effect on output — identifying main effects and interactions. This is more efficient than one-factor-at-a-time testing and is a core Improve-phase tool.
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