# Validation Stage — Elaboration

## Criteria Guidance

### Good criteria — concrete and verifiable

- "Row-count reconciliation shows zero discrepancy between source and target for every entity"
- "Spot-check validation compares at least 100 randomly sampled records per entity with field-level diff"
- "Performance benchmarks show target query latency within 10% of source for critical paths"

### Bad criteria — vague (no clear check)

- "Data looks correct"
- "Validation is complete"
- "Performance is acceptable"

