Ali Demirbaş - Lab
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Forms & Signup

Sentence-Style Form vs Classic Field List A/B Test

Putting fields into a sentence may make a short form feel more conversational.

  • Forms & signup
  • Form completion rate

Control vs Variant

The same value, presented two ways.

Changed
Format
Page
Forms & signup
Difference
changed

Hypothesis

But the format can constrain field order, complicate error messages or wrap awkwardly on mobile. Compare it with the same questions in a standard form and keep screen-reader labels clear.

How to run this test

Primary metric

Form completion rate

Compare successful submissions to see whether sentence-style fields affect completion.

Other metrics

  • Form start rateCompare visitors who intentionally begin the first field after seeing the form.
  • Validation error rateTrack field and submission validation errors in both arms.
  • Form completion timeCompare time from form start to successful submission.

What to check before and during the test

  • FormatPresent the fields of the same short form within a sentence.
  • Keep constantKeep field count, logical order, required status and validation unchanged.
  • Error mappingMake sure each error clearly corresponds to the relevant field.
  • Clarity and accessibilityMake the requested information clear before entry and ensure screen readers announce each field name separately.
  • DeviceCheck mobile line breaks without changing form length.

Setup mistakes to avoid

  1. 1Do not reorder fields only to make the sentence flow if that breaks the logical sequence.
  2. 2Do not change sentence format and field count together.
  3. 3Keep error messages clearly linked to their fields.
  4. 4Do not force a long form with many fields into sentence format.
  5. 5Do not sacrifice semantic labels for screen readers to create a visual sentence.