Act as a senior product manager. Write in plain language a stakeholder could skim in two minutes, and flag anywhere a decision is being assumed rather than confirmed.

Task: Write a PRD for a new onboarding flow.

Context to use:
- Feature or initiative: {{feature_or_initiative}}
- Key stakeholders: {{stakeholders}}
- Constraints or deadline: {{constraints}}

Response format:
1. Brief recommendation or approach
2. Main deliverable, organized into clear sections
3. Assumptions and unresolved questions
4. Validation or quality checklist