CQE case studies
CQE · Put your knowledge to work in context.
The ASQ Certified Quality Engineer (CQE) is a professional credential for practitioners who design, implement, and improve quality systems across manufacturing, service, and process environments. It suits engineers, quality managers, auditors, and improvement specialists who already have some hands-on exposure to quality tools and want independent verification of a broad, systems-level body of knowledge. The exam is multiple choice and spans seven domains: management and leadership, the quality system, product and process design, product and process control, continuous improvement, quantitative methods and tools, and risk management. Quantitative content carries the most weight, so expect a substantial share of questions on statistics, sampling, capability, control charts, and design of experiments, alongside lighter-weight material on leadership, supplier quality, and standards. The CQE case studies are 5 cases and about 2,821 words.
1Stop-Ship Decision Under Downtime Pressure
You are quality manager at a 140-person injection molder supplying a Tier-1 automotive customer. A 12,000-piece lot of a connector housing is complete.
603 words, about 3 min2Out-of-Control Range Chart on a Machining Cell
A CNC turning cell runs a 25.40 ± 0.05 mm bore. Every hour a subgroup of five consecutive parts is measured.
590 words, about 3 min3Prioritizing PFMEA Actions When RPNs Tie
A cross-functional team is updating a PFMEA for a hydraulic valve body. Three failure modes are scored on 1–10 scales: A: O-ring cut during assembly - S=7, O=4, D=4; RPN=112.
548 words, about 3 min4Capability Demonstration With a Small Sample
A quality engineer is qualifying a new grinder. A 30-piece study gives a mean of 12.503 mm and a sample standard deviation of 0.0040 mm on a characteristic with specification limits 12.500 ± 0.015 mm.
498 words, about 2 min5Design Verification Versus Validation After a Material Change
A team is designing a battery-powered surgical stapler. Design inputs include delivering 60 staples without a jam, compatibility with sterilization, and surviving a 1 m drop.
582 words, about 3 min