Solution

Software Quality Assurance (SQA)

Systematic, planned set of actions to ensure quality in process and product. Prevention-oriented (vs QC which is detection). Encompasses standards, reviews, audits, testing, process improvement.

Quality Matrices / Metrics

1. Product Quality Metrics:

• Defect Density = Defects / KLOC or FP - reliability indicator
• Mean Time To Failure (MTTF) / MTBF
• Customer Satisfaction (surveys)

2. Process Metrics:

• Defect Removal Efficiency (DRE) = Defects removed before delivery / Total defects
• Review Efficiency = Defects found in review / total

3. Project Metrics:

• Cost of Quality (prevention + appraisal + failure cost)
• Schedule variance, Effort variance

McCall / Boehm Quality Factors: Correctness, Reliability, Efficiency, Integrity, Usability, Maintainability, Testability, etc.

Measurement: GQM paradigm (Goal-Question-Metric).