Primary debug scenario

Symptom: Coverage at 98%. Team wants to sign off. 2% is ordering cross bins.

Triage steps

1. List unhit bins — are they reachable in this configuration?

2. If reachable: write directed test to hit them.

3. If unreachable: document exclude with rationale.

4. If risky to exclude: constrained-random target for those bins.

5. Never sign off ordering coverage gaps without explicit review.

Common pitfalls

• Closing coverage % without requirement trace.

• Waiving bins without risk assessment.

• Constrained-random depth instead of gap analysis.