Ali Demirbaş - Lab

Forms & Signup

Testing Short Helper Text Under Each Form Field

A short explanation below a field may clarify the expected value before an error occurs.

  • Forms & signup
  • Validation error rate

Control vs Variant

Absent on one side, present on the other.

Changed
Presence
Page
Forms & signup
Difference
added

Hypothesis

Extra copy can also increase reading effort. Test one field selected before launch, without changing its design or validation.

How to run this test

Primary metric

Validation error rate

Define the same eligible input attempts in both arms and compare validation errors.

Other metrics

  • Form completion rateMake sure completion does not fall.
  • Field-level abandonmentCheck whether visitors are less likely to leave the field with added guidance.
  • Average completion timeTrack material increases in completion time and review reading burden separately.
  • Support contactsCheck whether questions about the same field decrease.

What to check before and during the test

  • Helper textAdd one predefined, always-visible short explanation below the selected field.
  • Keep constantKeep field design, label, validation and error messages unchanged.
  • ScopeChoose a field based on observed errors instead of adding copy to every field.
  • AudienceReview new and returning users separately.
  • Separate testsTest examples, on-focus help or additional fields separately.

Setup mistakes to avoid

  1. 1Do not add help to every field and make it impossible to identify what worked.
  2. 2Do not use helper text as a replacement for an error message.
  3. 3Do not hide the explanation behind a click if the test is meant to add visible guidance.
  4. 4Keep the helper text readable; do not use low-contrast gray.
  5. 5Do not use explanatory copy to patch a field design that needs a more direct fix.