quality-assurance

Track four metrics: defect escape rate, change failure rate, MTTR, and defect age. Each answers a different question, and ratios matter more than absolute counts because raw defect numbers move with feature volume and reporting culture.

Elite performers keep change failure rate under 15 percent, while teams above 30 percent usually have a release-safety problem rather than a testing problem. Define what counts as a failed deployment first and keep that definition stable.

Score each area on likelihood (1-5) and impact (1-5), multiply them, and allocate test depth by the resulting risk score. Re-score quarterly and after any significant production incident, since risk shifts with ownership and change frequency.

No. Coverage measures execution, not assertion, so a suite can execute every line while verifying nothing. Use coverage only to find untested areas, and track escape rate, change failure rate, MTTR, and defect age as the real quality signals.

A dedicated late testing phase finds defects at maximum distance from their cause, gets compressed when dates slip, and makes quality one group's responsibility. Replace it with gates spread through the flow: testable acceptance criteria, contract tests, feature flags, and canary releases.