Chapter 2 38 leads to subsets of learning modules on mindfulness, emotion regulation, and stress tolerance. In ‘diary’, the user can record feelings experienced. In ‘profile’, he or she can adjust settings and personal information such as uploading a personal picture. The user can also store encouraging items such as favorite pictures and quotes. Via the ‘central’ button the user can navigate back and forth to all the modules and functions available in this prototype. To develop an architecture of the personalised virtual coach, including the two vital parts – the behaviour chain-analysis and the emotion diary, the Persona and use-case scenario were translated into user stories (example: ‘As a user (Lisanne) I would like to get an overview of my diary so that I can see my history’). Next, user stories were translated into a functional prototype of the architecture of the virtual coach. Heuristic expert evaluation Iterative user evaluation in the early design stage is essential to obtain early feedback from the potential users and so improve the protoype. An expert evaluation of the first version of the clickable prototype of the user interface was conducted by a usability expert (a lecturer in User Centered Design at Hanze University of Applied Sciences) This expert was asked to perform eight different tasks. The heuristics [48-49] were scored using a 5-point Likert-scale (1=does not fulfil requirements; 5=fulfils requirements). Examples of the applied heuristics include: “Is there an option to navigate back (button)?”; “Is there a facility for horizontal scrolling?”; “Do drop-down menus have a logical order?”; “Is there sufficient contrast between text and background?”. The expert was guided through a task scenario. Tasks were: Log in to the app; Read the introduction about the app; Read the Frequently Asked Questions; Communicate with the Virtual Coach about your eating behaviour; Setup/configure your profile; Set the alarm to receive daily notifications; Check on available modules and Fill in your diary. The results were used to modify and to adjust the prototype.
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