Ali Demirbaş - Lab

Forms & Signup

Privacy Reassurance Next to a Form Field A/B Test

A form asking for email or phone details may raise concerns about spam or data use.

  • Forms & signup
  • Form completion rate

Control vs Variant

Absent on one side, present on the other.

Changed
Presence
Page
Forms & signup
Difference
added

Hypothesis

A short, truthful explanation beside the field could address them, while an unnecessary reassurance might create new doubt. Match any promise to actual data practices.

How to run this test

Primary metric

Form completion rate

Compare registrations to see whether a privacy assurance affects completion.

Other metrics

  • Field-level abandonmentCompare visitors who leave before completing the field with the assurance.
  • Form completion timeMeasure time from form start to successful submission consistently.
  • Privacy complaintsTrack recorded complaints about a mismatch between the assurance and actual data use.

What to check before and during the test

  • MessageAdd one truthful assurance next to the predefined field.
  • Keep constantKeep fields, consent requests, data use and the existing privacy-policy link unchanged.
  • AccuracyVerify the promise against actual data practices before launch.
  • AudienceReview predefined form types that request email or phone separately.
  • Separate testsTest placement, icon or alternative wording separately.

Setup mistakes to avoid

  1. 1Do not promise privacy protections the business does not provide, such as saying data is never shared when it is.
  2. 2Do not change the assurance and form field count together.
  3. 3Do not use the message as a replacement for the full privacy policy; keep the policy accessible.
  4. 4Do not make the assurance so prominent that it overshadows the form.
  5. 5Do not use an assurance in place of legally required consent or privacy information.