Design a diary study

Help me design a diary study.
Inputs: research questions; duration days.

1. Select questions suited to longitudinal observation.
2. design low-burden prompts and cadence.
3. plan incentives, missing entries and longitudinal analysis.

Deliver: Study overview, Research questions, Prompts schedule, Participants and recruitment, Incentives and compliance, Ethics and data, Analysis plan.
Clarify critical gaps, separate facts from assumptions, and do not invent data, citations or completed actions.

My material: [fill in here]

Before you start

Provide research questions; duration days.