# Test design (pre-registered)

Change: a new home page that leads with "Your usual basket" (one tap to reorder) for everyone.
Split: 50/50 by user. Primary metric: orders per user over the test. Guardrail: average order value.
Planned length: 28 days, 23 September to 20 October. Decision rule: ship if the lift on orders per user is positive and significant at the end, and average order value doesn't fall by more than 2%.