Developing a Personalized Virtual Coach for Emotional Eaters 47 2 aloud usability tests using eye tracking. First results demonstrated that users are positive towards the virtual coach prototype. However, the first results are rather limited due to a small number of participants and the incomplete analysis of the eye gaze tracking data. As a next step, the user interface of the ‘Denk je zèlf!’ virtual coaching application will be modified, further developed and iteratively evaluated by a larger number of target users. Within this next design and evaluation phase, the preferred appearance of the virtual coach will be investigated, in order to ensure that the virtual character, whether a peer or a health professional, is visually appealing and motivating for the emotional eaters. In addition, the content of the dialectical dialogue feedback messages of a virtual coach will be derived and iteratively validated with users, based on handbooks for therapists and online user forums. The users will be given small assignments such as navigating to the virtual coach and starting a conversation. Participants of the next user evaluation session will be asked to judge the responses of a virtual coach in terms of their persuasiveness, faithfulness and truthfulness. The output will not only benefit the quality of the user experience and the virtual coach interface, but will also inform future design and summative evaluation. Figure 6 | Clickable visual prototype of the user interface with screens virtual coach, module mindfulness and profile
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