This paper describes a survey system that can validate responses received in an online survey. The survey system can deem an answer to a survey in progress as likely unreliable and dynamically add a verification question. The survey system can deem an answer as likely unreliable in several ways, including receiving the answer too quickly or receiving an answer inconsistent with what is known about the user. A spammy answer can come from a user clicking through the survey without considering the question, or by a web robot configured to click through the survey to access an online document or a web application. If the survey system receives an answer that it deems likely unreliable, it can present the user with a verification question that is similar to the original question, but with the answers presented differently. If the answer to the verification question is consistent with the original answer, the survey system can deem the response as non-spammy and continue accordingly. If the answer is inconsistent with the original answer, the survey system can deem the response as spammy and take appropriate action.
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Li, Kang, "Behavior-Triggered Answer Reconfirmation for Spam Detection in Online Surveys", Technical Disclosure Commons, (April 28, 2015)