Design and Testing of a Digital Platform Prototype for Supporting a Healthy Lifestyle

This master’s thesis focuses on the design and validation of a prototype digital platform called Harmonea, aimed at supporting a healthy lifestyle. The practical relevance of the thesis stems, on the one hand, from the growing importance of prevention, longevity, behavioral models of behavior change, and a holistic approach to health that integrates movement, nutrition, recovery, and professional care, and on the other hand from the assumed usefulness of connecting relevant data, information, experts, and clients through a digital platform. This assumption was explored through interviews with potential users and professionals operating in this field. The aim of the thesis was therefore to design and validate a prototype of a digital platform that would enable the centralization of activities, recommendations, health data, and communication between users and professionals within a single digital environment. The theoretical part defines digital platforms, principles of UX and UI design, information architecture, prototyping, usability testing, and behavioral approaches supporting long-term habit change. The practical part is based on exploratory qualitative research conducted through semi-structured interviews with potential users and professionals. The collected insights were subsequently translated into the design of the information architecture, user stories, and a high-fidelity prototype of the Harmonea application. The prototype was then validated through moderated usability testing complemented by the System Usability Scale questionnaire. The results showed that the core concept of the platform was perceived by respondents as understandable and potentially beneficial. At the same time, the testing identified several areas requiring further iteration, particularly in navigation, visual hierarchy, handling of health data, and terminology used in certain sections. The thesis provides a validation basis for the further development of the Harmonea platform and demonstrates how insights from UX design, behavioral models, and digital platform theory can be applied in the design of a specific digital service.