Ali Demirbaş - Lab
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Cart & Checkout

A/B Test: Confirming Choices Made During Checkout

A brief written confirmation after a selection may reassure shoppers that it was saved and reduce repeat clicks.

  • Checkout
  • Order completion rate

Control vs Variant

Absent on one side, present on the other.

Changed
Presence
Page
Checkout
Difference
added

Hypothesis

Keep the interface clear and prevent the message from shifting the page.

How to run this test

Primary metric

Order completion rate

Compare completed orders to see whether written selection confirmation affects completion.

Other metrics

  • Selection error rateMeasure errors only through predefined correction events or user reports.
  • Repeat click rateTrack visitors who click the same option again after selecting it.
  • Post-selection change rateCompare how often visitors change their selection before completing the flow.
  • Order return rateTrack returns over the same follow-up period; report selection-related returns separately where identifiable.

What to check before and during the test

  • Written confirmationShow a short message after the selection is saved.
  • Keep constantKeep the selection control, save behavior and existing color or icon states unchanged.
  • Diagnostic measuresTrack selection errors and repeat clicks to help explain any change in completion.
  • LayoutKeep the message from shifting content or causing accidental clicks.
  • AccessibilityCheck mobile visibility and screen-reader announcement; test timing or icon changes separately.

Setup mistakes to avoid

  1. 1Do not rely on color alone to confirm a selection; provide another clear signal.
  2. 2Do not let the confirmation message shift the page.
  3. 3Do not change the confirmation style and selection control design together.
  4. 4Show confirmation only after the selection is actually saved.
  5. 5Do not call a win from fewer errors without checking completion.