# Extraction Stage — Elaboration

## Criteria Guidance

### Good criteria — concrete and verifiable

- "Extraction logic handles incremental loads using watermark columns identified in discovery"
- "Connector includes retry logic with exponential backoff and dead-letter handling for failed records"
- "Schema drift detection raises alerts rather than silently dropping or truncating columns"

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

- "Extraction works"
- "Data is pulled from sources"
- "Connectors are configured"

