# Discovery Stage — Elaboration

## Criteria Guidance

### Good criteria — concrete and verifiable

- "Source catalog documents at least all known data sources with connection type, schema, and estimated row counts"
- "SLA requirements are captured for each target table including freshness, completeness, and acceptable error rates"
- "Schema analysis identifies all nullable fields, data type mismatches, and encoding inconsistencies across sources"

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

- "Sources are documented"
- "Schemas are understood"
- "Requirements are gathered"

