Chapter 5 104 5.3.3 The intervention design: lessons learned In the design of the intervention, four major themes emerged concerning challenges and corresponding solution strategies. The first challenge centered on personalization, highlighting the need to consider variations in user preferences, physical abilities, and usage patterns. To tackle these issues, the theme of adaptive design revolves around solutions that focus on self-adaptive features or allow users to tailor the design, content, and tone to their specific needs. The second significant challenge pertained to the intervention’s limited functionality. Given our constrained resources and the need for a user-friendly design, we included only essential features, which consequently reduced the intervention’s overall functionality. The solution theme, embracing simplicity, suggests that the optimal approach is to start with a straightforward, usable app, avoiding the risk of overcomplicating it with unnecessary features. The main lessons learned are twofold: (3) Personalization of aspects of the design and content to be able to tailor the intervention to user needs, capabilities, and interaction styles is crucial for maximizing the intervention’s alignment with the target group, and (4) Opting for a minimalist approach in the design, by concentrating on core functionalities and ease of use, helps to reduce resource expenditure and enhances user engagement. 5.3.4 Formative evaluation of intervention design For our secondary research question regarding the formative acceptance of the intervention prototype, we found that participants generally rated the usability of the intervention positively (see Table 5.3). Six (86%) participants reported that it required a manageable level of effort and six reported it caused minimal frustration. All participants reported being positive about their performance in executing tasks. Five (72%) participants found the prototype easy to use. The participants did also identify a few minor usability issues. These included confusion about how to revisit completed messages and a lack of awareness of the scrolling functionality within the interface. Furthermore, regarding the experience with using the intervention, the majority (57%) indicated they would have found it useful during their waiting period. The participants who did not think the intervention would be useful to them indicated a preference for face-to-face contact instead and not having a clear idea about the value of the content. Six (86%) participants expressed a high degree of enjoyment in using the intervention and six expressed a strong likelihood of recommending it to others. As a reason for this, the participants mentioned appreciating the playful nature of the interface, remarking that its engaging design fostered a positive, uplifted mood. Furthermore, they expressed a sense of anticipation and curiosity about the daily messages they would receive.
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