| 1. Make duplicate/siloed survey instances available through different links to minimize link sharing |
| 2. Remove terms “survey” or “study” from the text of the survey weblink (for example, “redcap.link/example” rather than “redcap.link/examplesurvey”) |
| 3. Activate IP logging features, if available |
| 4. Enable time zone checks to ensure respondent’s computer is in the target time zone, if applicable |
| 5. Add speed bump questions to promote respondent attentiveness and reduce automatic responses |
| 6. Include false/impossible response options (such as a selection for “TV ad” when recruitment never occurred through TV ads) to flag suspicious responses |
| 7. Use within-survey validation (e.g., ask county and ZIP code of residence at multiple points to ensure consistency in responses, or ask the identical question more than once) |
| 8. Deploy cross-survey form validation (e.g., ask the same question on an eligibility screener and survey to compare responses for consistency across forms) |
| 9. Include an open-ended response survey question to flag nonsensical or irrelevant content |
