“…However, using only extrinsic rewards should be carefully considered, because of a potential detrimental effect on the users' intrinsic motivation, impoverishing the overall experience the system can provide (Deci et al, 1999). Nevertheless, how to employ game elements to elicit also intrinsic motivations in non-game contexts is started to be investigated: by leveraging the social aspects of games, such as cooperation among groups, and by providing rewards that incorporate different values, such as power and reputation, it is possible to satisfy the needs of competence, autonomy and relatedness that support the development of intrinsic motivations (Rapp, 2015). In this manner, it is possible to foresee different gamification strategies along the user journey, where in the first stages extrinsic rewards can quickly involve users, and in the later ones intrinsic motivations can support a long-standing engagement.…”