# Prior Research — Review & Edit: Substitution Structure

## Related studies

### Accept/Reject Substitution Control (Project 1) — 2025
**What was tested:** Three interaction patterns for accepting/rejecting a substitution after picking (toast confirmation; edit → review → result; inline toggle).
**Key findings:** A dedicated page with an explicit save gave customers the most confidence their choices were recorded. Visible control plus clear timing reduced refunds for unacceptable substitutions by ~50%.
**Recommendations made:** Give customers upstream control before picking, not just recovery after.
**Status:** Implemented (Project 1). This study (Review & Edit) is the upstream follow-up.

## Known patterns from past research
- Customers want one place to manage preferences across the whole order
- Trust comes from clear communication of what will happen, not just from control
- System terminology ("eligible / ineligible") tends to confuse; outcome language is clearer

## Open questions from past research
- Best structure for a full order of items (this study)
- Whether ineligible items should be educational (teach the rule inline)