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Nudge Theory is a groundbreaking concept which proposes that subtle changes in the way choices are presented can intuitively guide individuals towards desired behaviors [1]. Fourteen years after Peter Thaler brought this theory, there has been substantial research into its application in research and practice. For example, Maiden and his colleagues [2] were able to significantly encourage employees to take the stairs over the elevator by incorporating footprints and posters that reveal the “desired path”. Lee and his colleagues [3] redesigned a snack-ordering website to encourage healthy choices by locating healthy snacks on the first two pages of the website and unhealthy ones on the last two. Another example was provided by Haque and his colleagues [3] who designed a simple zero-cost nudged intervention with a personal normative message installed in users’ smartphones as a screensaver to dissuade physical inactivity. This simple modification of the environment, where individuals make decisions, was able to nudge 53% of the participants to opt for a healthy snack [4]. One limitation of present technology-based nudges is the limited understanding of their long-term effects and whether nudging effects sustain once the nudges are removed [5].

Persuasive and gamification techniques also hold great potential for motivating desired behaviors, for instance promoting physical activity [6]. Design principles such as selftracking, tailoring and personalization are well-known and deeply studied in the HCI (Human-Computer Interaction) field. For instance, self-tracking is one of the most prominent theoretically informed techniques used in …