LSS Green Belt · PeopleCert · Control · Bank updated 2026-07-03
LSS Green Belt practice questions: Control
5 free questions from 30 on this area · answer and explanation for each · no sign-up
These 5 questions come from the Control section of our LSS Green Belt bank (30 questions on this area, which carries 20% of the real exam). Every question is original, with the correct answer explained and linked to the source it is drawn from.
1/5 · Control · easy
A hospital redesigns an IV administration set so that an epidural line connector cannot physically be attached to an intravenous port, eliminating the possibility of a wrong-route medication error regardless of operator attentiveness. This is a direct example of which lean control mechanism?
AStatistical process control
BVisual management via 5S
CKanban
DPoka-yoke (error-proofing)
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2/5 · Control
A call center audits a different number of recorded calls each day (sample size varies daily) and classifies each audited call as either script-compliant or non-compliant. Which control chart correctly tracks the proportion of non-compliant calls over time?
AU chart
BC chart
CNP chart
DP chart
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3/5 · Control · hard
A Green Belt team is finalizing the control plan for a redesigned invoicing process before project closure. Which of the following is a required element of a properly constructed control plan?
AA record of individual performance appraisals for each operator on the process.
BA complete list of every improvement idea considered and rejected during the Analyze phase.
CA documented reaction plan specifying the corrective action, responsible owner, and escalation path when an out-of-control signal or defect is detected.
DA full financial return-on-investment calculation for the entire improvement project.
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4/5 · Control
An Xbar control chart for fill volume has a centerline of 50 mL and 3-sigma control limits of 56 mL (UCL) and 44 mL (LCL). The most recent subgroup average is 57 mL, and no other unusual patterns appear in the surrounding data. What should the process owner conclude and do?
ABecause 57 mL is only 1 mL above the UCL, it still reflects common cause variation and can be treated as normal process noise.
BThe control limits should be recalculated using 57 mL as the new maximum before any investigation begins.
CThe 57 mL point falls beyond the UCL, signaling a special cause; investigate the specific condition behind that subgroup rather than adjusting the overall process.
DA single point beyond the control limits is not sufficient evidence of special cause; only a run of 7 or more consecutive points is meaningful.
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5/5 · Control · easy
As a DMAIC project moves toward closure, the team develops a control plan for the improved process. What is the main purpose of this control plan?
ATo list all root causes that were eliminated during the Analyze phase for historical record-keeping.
BTo document the methods, measurements, responsibilities, and reaction plans needed to sustain the process improvements after the project closes.
CTo record the statistical formulas used to calculate Cp and Cpk for audit purposes.
DTo restate the project charter's business case to justify future, unrelated projects.
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B is correct. The control plan translates the project's improvements into an operational document specifying what will be measured, how often, by whom, and what to do if the process drifts out of control. It is the mechanism that keeps gains from eroding once the Green Belt and project team move on. This is distinct from earlier-phase artifacts like the charter or root-cause analysis.
↗ the IASSC Lean Six Sigma Green Belt Body of Knowledge — Control
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