Developing a Personalized Virtual Coach for Emotional Eaters 45 2 Evaluation of the first prototype:‘Denk je zèlf!’ virtual coach The expert user was asked to perform eight task scenarios based on 15 heuristics [44-45]. The overall impression, conveyed by the user expert was good, but he remarked that: 1 the functionalities horizontal and vertical scrolling are not yet fully operational; 2 no clarity about where to find oneself in the process; 3 difficulties in locating the virtual coach; 4 some modules do need additional explanation. The feedback given was processed and the second clickable prototype was built. Ten test users performed the eye tracking test and a Retrospective Think Aloud session. According to the results of a usability test (see Table 1), the virtual coach application scored highly on the usability, which in this case is defined as the accurate execution of a given task via a user interface. The accuracy of the tasks were assessed on a scale of 1-3. A task is graded 1 if the user fails to perform the task, grade 2 when the performance is done with (some) difficulties and a 3 for a problem-free performance. Two of the tasks scored as unsatisfactory: users found it difficult to navigate to and to find the biography, and to adjust the settings for a notification and to understand its purpose. Users tend to tap on the ‘No logon code? Read this’ link because they had no idea of how to log in to the application. They tried to utilize a non-active link in the text or to navigate back to the login page. Adjusting the personal profile was a difficult task because the corresponding button was labelled ‘settings’ and that made it hard to find. Some users had difficulties with setting up a notification. The routing via the start button and the ‘hamburger menu’ (icon with three parallel horizontal lines) was considered accurate but the alarm icon was not recognised. Test users delivered feedback such as: ‘It is not easy to obtain a login code’, ‘It is difficult to locate personal settings’ and ‘I don’t like the color orange.’ The designers used clickable prototypes. That means that the interface does not offer unlimited navigation and interactivity. This should have been communicated more accurately to the users.
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