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PMP Practice: Evaluate quality metrics and apply lessons learned

Question 5 of 5 in Plan and Manage Quality of Products/Deliverables

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Birch Volkov is managing a medical device manufacturing project for Starfish & Ocean Petersen. The project follows a predictive approach with strict regulatory compliance requirements. During the manufacturing phase, the quality assurance team reports that 8% of the latest production batch failed initial inspection, slightly above the 5% threshold defined in the quality management plan. The manufacturing process has been stable for the past three batches, and this is the first increase in defect rates. The team has already documented the defects and isolated the affected units. What approach would be MOST effective for Birch to address this quality variance?
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Correct answer: Conduct a root cause analysis to identify why the defect rate increased before taking corrective action

Explanation

When quality metrics exceed defined thresholds, the most effective approach is to understand why the variance occurred before determining corrective actions. Conducting a root cause analysis allows the project manager to identify the underlying cause of the increased defect rate—whether it is a material issue, equipment calibration problem, human error, or process deviation. This diagnostic step is essential in a predictive, regulated environment where changes must be deliberate and evidence-based. Once the root cause is identified, Birch can implement targeted corrective actions that address the actual problem rather than treating symptoms. The scenario indicates this is the first increase after stable performance, making investigation the logical first step before escalating or changing processes.

**Why not A:** Immediately halting production and escalating to the sponsor is an overreaction for a first-time defect rate increase of 3 percentage points above threshold. The defects have been documented and affected units isolated, so the immediate risk is contained. Root cause analysis should precede escalation to provide the sponsor with actionable information.

**Why not B:** Updating the quality management plan to accept 8% defects lowers quality standards rather than investigating and correcting the underlying problem. In a regulated medical device environment, adjusting thresholds to accommodate variance without understanding the cause could have serious safety and compliance implications.

**Why not D:** Increasing inspection frequency addresses detection but not prevention. More inspections will catch more defects but do not fix the root cause of the increased defect rate. Without understanding why the rate increased, the underlying problem will persist or worsen regardless of how often inspections occur.

Key Concept

This question covers Evaluate quality metrics and apply lessons learned under Plan and Manage Quality of Products/Deliverables (Process).

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