This are the only thing that you team need to write effective PRD
- Intent: "Reduce churn 12% by re-activating dormant users within 7 days"
- Constraints: "Must work with existing Firebase setup, 2-week sprint, avoid email fatigue"
- Evidence: "3 churn surveys support ticket pattern showing users forget we exist"
- Team context: "Engineer lead prefers async reviews, designer needs 3 days for flows"