Developing a Personalized Virtual Coach for Emotional Eaters 37 2 The use-case scenario is developed based on Personas (Fig. 3) and the specific lifestyle characteristics of the emotional eaters from the literature and interviews. Personas Figure 3 | Key Personas Lisanne and Anita Design & prototyping During the design phase, a first clickable prototype of the graphical user interface was designed, based on two Personas, namely Lisanne and Anita (Fig. 3), and the Gestalt design principles [47], Nielsen’s usability heuristics [48], and Gomez’s heuristics on mobile devices [49]. The wireframes were created in Adobe Illustrator and reshaped to screens in Adobe Photoshop. Interactivity was added using InVision. The prototype consists of loading screen (visible when the application is loading), a login screen and a link to Frequently Asked Questions. The user is shown an informative text about how to use this application. Navigation is divided into four buttons: ‘coach’, ‘modules’, ‘diary’ and ‘profile’. The user can start a conversation with the coach through dialogues in a Whatsapp (messaging application for smartphone) layout style. The button ‘modules’ Lisanne, 25 years, high educated “I wish that I was more confident about myself …” Background Lives alone, single / High school graduate / Suffers from obesity / Co-morbidity unknown / l. 1.62 mtr., w. 91 kgs. Attributes Feels insecure about her body / Is not able to sense the difference between hunger, appetite or emotion / Fears experiencing what she really feels. User needs Education on eating behaviour / Selfconfidence / Help to set realistic goals / Support from peers. Anita, 46 years, limited education “When I am stressed out I start snatching the cookie tin” Lives with husband and two sons / low SES / Suffers from obesity / Co-morbidity unknown / l. 1.65 mtr., w. 85 kgs. Is worried about putting on more weight / Suffers from stress and finds comfort in food / Has a ‘sweet tooth’ / Hates to be patronized by authorities. Stop gaining more weight / Education about healthy food / Getting support from her family / Stop harassing thoughts.
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