Skill: cc-quality-practices

STOP - The Quality Principle

Improving quality reduces development costs. No single defect-detection technique exceeds 75% effectiveness. Combining techniques nearly doubles detection rates.

Critical ratio: Mature organizations have 5 dirty tests for every 1 clean test.

Debugging rule: Do NOT skip to FIX without completing STABILIZE → HYPOTHESIZE → EXPERIMENT. ~50% of defect corrections are wrong the first time.

Key Definitions

External vs Internal Quality

• External (users care about): Correctness, usability, efficiency, reliability, integrity, robustness
• Internal (developers care about): Maintainability, flexibility, portability, reusability, readability, testability

Internal quality enables external quality. Poor maintainability → can't fix defects → poor reliability.