Introduction
Web surveys have become a widely adopted approach for data collection in many fields due to their low costs and efficiency. Nevertheless, due to the high competition for respondents' time and attention, web survey companies are struggling to recruit Web respondents, keep them engaged in online surveys, and ensure adequate data quality. One possible avenue to ameliorate these threats is through the use of innovative survey designs. Interest in this area is apparent in the attention that concepts like gamification (see for review Keusch & Zhang, 2015) have received or the increased interest in esthetics in the human computer...