CQI Study Guide 2026

Audits are systematic, independent examinations of an organization's processes, systems, or products to determine if they comply with established standards, policies, or procedures. In quality control, audits verify that quality management systems are effectively implemented and maintained, identifying any non-conformities or opportunities for improvement. They provide an objective assessment of compliance and operational effectiveness, driving continuous improvement.

Producer's risk (α) is the probability that a good lot meeting the AQL is incorrectly rejected, representing the risk borne by the supplier.

The X-bar and R chart monitors variable (continuous) data by tracking subgroup averages (X-bar) and ranges (R) to detect process shifts and spread changes.

Continuous improvement is a core principle in quality control that emphasizes ongoing, incremental enhancements to processes, products, and services. It involves regularly evaluating current practices, identifying areas for optimization, and implementing changes to achieve higher quality levels. This iterative approach ensures that quality standards are not just met, but consistently elevated over time, leading to sustained excellence.

Corrective action reports (CARs) are formal documents used in quality control to systematically address non-conformities or issues. Their role is to document the identified problem, investigate its root cause, outline the specific steps taken to correct it, and verify the effectiveness of those actions. This process ensures that quality problems are not only resolved but also prevented from recurring, providing a clear record for continuous improvement.

Eight consecutive points on the same side of the centerline (a Nelson/Western Electric rule) indicate a process mean shift, signaling special cause variation.