LSS Green Belt · PeopleCert · Control · Bank updated 2026-09-19
LSS Green Belt practice questions: Control
5 free questions from 32 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 (32 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.
Free: 6 questions in study mode, no card. All 32 Control questions and the full LSS Green Belt bank: $15 one-time.
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)
2/5 · Control
A packaging line inspects exactly 200 boxes every shift (a constant sample size) using a pass/fail check and counts how many boxes are defective. Which control chart tracks the actual count of defective units under these conditions?
ANP chart
BU chart
CP chart
DC chart
3/5 · Control · hard
As a Green Belt project reaches closure, the improved process must be handed over to the process owner and operators who will run it going forward. Which action best ensures the improvement gains are sustained after the Green Belt moves on?
ATrust that the improved metrics will remain stable on their own since the root causes were already removed during Improve.
BHave the Green Belt personally continue monitoring the control chart indefinitely so operators are not burdened with the new procedure.
CArchive the project documentation and only revisit the process if a major failure is escalated to senior executives.
DTransfer the completed control plan and updated standard work to the process owner, with training and clearly assigned monitoring responsibility.
4/5 · Control · hard
Three months after a Green Belt project transferred an improved process to the process owner, defect rates begin drifting back toward the pre-project baseline, even though a completed control plan is on file. Which explanation is most consistent with a breakdown in sustaining the gains?
AThe drift reflects only common cause variation, which control plans are not designed to manage, so no action is required.
BBecause the process owner now holds ownership, the original project team remains responsible for indefinitely monitoring the process going forward.
CThe project should be re-run from the Define phase before investigating the current process performance.
DThe reaction plan specified in the control plan is not being followed when the monitored characteristic signals out of control, so corrective action is not being triggered.
5/5 · Control
A control plan for a machining cell lists the control charts used, the gauges, the sampling frequency, and the specification limits. A new team member asks what else should be included so operators know exactly what to do the moment a chart signals an out-of-control condition. What is missing from the control plan?
AAdditional hypothesis tests to reconfirm the root cause identified during Analyze.
BA complete redesign of the process FMEA to reflect the new machining sequence.
CA revised project charter describing a new problem statement for the next improvement cycle.
DA documented reaction (response) plan specifying the corrective steps and escalation path operators must follow when a special cause signal appears.
Answer: D. A complete control plan pairs each monitoring method with a reaction plan (sometimes called an out-of-control action plan) that specifies immediate corrective steps and escalation contacts. Without this, operators may detect a signal but not know how to respond, undermining the sustainment of the improvement. This is a frequently overlooked component compared with the more obvious chart and measurement details.
Source: the IASSC Lean Six Sigma Green Belt Body of Knowledge — Control
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