Quality and Performance Monitoring
Quality management ensures the project meets requirements through planning, managing, and controlling quality. Candidates must distinguish quality assurance (process-focused, preventive) from quality control (product-focused, inspection-based). Know the cost of quality: prevention and appraisal costs (cost of conformance) versus internal and external failure costs (cost of nonconformance). Understand tools such as cause-and-effect diagrams, Pareto charts, control charts, flowcharts, and checklists, and the concept of statistical control limits versus specification limits. Performance monitoring uses metrics, dashboards, and variance analysis to track progress against the baseline.
Traps: confusing quality with grade - low grade is acceptable if it meets requirements; low quality is never acceptable. Confusing prevention with inspection: prevention is generally cheaper than rework. Control chart questions often test whether points fall within control limits (process is stable) versus specification limits (customer requirements). Also watch for confusing verification (conformance to requirements) with validation (fitness for use).
Rule of thumb: assign causes to the few vital problems using a Pareto chart; a process is in control when variation stays within control limits, regardless of specification limits.
Worked example: A control chart shows all points within control limits but some outside specification limits; the process is statistically stable yet produces nonconforming output, so the process itself must be redesigned.