Chapter 4 74 the Delphi study to identify the roles of professionals to be included: policy officers, health care providers, eHealth developers, and researchers. To contact these professionals, we used expert recommendations and snowball sampling. For the first evaluation session, we invited at least 1 of each type of professional through email. For the second evaluation session, we invited, through email, professionals from round 1 as well as new professionals. In web and usability design, the rule of thumb is that testing with just 5 participants can uncover at least 80% of user insights when the aim is to generate insights rather than validate them (Nielsen & Landauer, 1993). Although this number can vary depending on the project (Bevan et al., 2003), we followed this guideline by targeting a minimum of 2 participants for each role to ensure a well-rounded set of user insights. It is important to note that qualitative research aims to understand the human experience in a comprehensive, nuanced manner. While it may not quantify the prevalence of a specific experience or need in the same way as quantitative research, it aims to explore the depth, meaning, and significance of such experiences or needs within a specific context or population. 4.2.2.3 Development of prototypes For the first prototype evaluation session, we developed 3 low-fidelity (quick and dirty) prototypes of the website. These prototypes provoked our participants to comment on the ideas instead of specific features (e.g., colors used and button placement). To develop these prototypes, we gathered inspiration on navigation, credibility, tone of voice, applicability, communication style, and user perspective from existing tools (e.g., guidelines and roadmaps) on eHealth development, inclusivity, low SEP, low health literacy, accessibility design, and general design using the Miro whiteboard platform (RealtimeBoard, 2022). We identified reoccurring elements, such as dos and don’ts, personas, examples, and tips. As a final step, we synthesized the individual elements into 3 clickable prototypes in Microsoft PowerPoint. For the second prototype evaluation session, we developed an improved prototype based on the results of the first evaluation using the Wix website builder (Wix.com Limited, 2022). 4.2.2.4 Evaluation of the prototypes and content Both evaluation rounds comprised individually conducted semi structured interviews and used the think-aloud method, where participants verbalized their thoughts, to gather information. Semi structured interviews are an effective approach for collecting information, while the think-aloud method serves as a valuable technique to gain insights into user thoughts and perceptions (Jaspers, 2009). These methods enabled us to understand the target group better and contributed to the creation of an appealing
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