Background
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In recent decades, the development of health technology systems to support patients and health care professionals (HPs) has increased dramatically. For instance, information and communications technologies (ICTs) have recently emerged as valuable tools for telerehabilitation in older adults (OAs) and various patient groups. Telerehabilitation can be defined as the delivery of rehabilitation services from a distance using ICTs [An emerging training approach that lends itself to telerehabilitation is the use of exergames (ie, interactive video games that combine motor and cognitive tasks [Although popular exergame systems such as Nintendo Wii or Xbox Kinect exist, they were not purpose developed for training OAs, potentially overlooking their unique needs. An alternative solution is the Continuum-of-Care (COCARE) system (Dividat), an exergame-based telerehabilitation system designed to meet the specific needs and requirements of OAs. Overall, the system comprises an exergame-based training tool, an assessment system, and a centralized digital case manager (rehabilitation cockpit).To ensure the usability, feasibility, and effectiveness of new technologies for rehabilitation, a user-centered design (UCD) approach is essential. UCD is defined as an iterative design process involving end users at every stage of a research and development project. This approach facilitates a comprehensive understanding of the factors influencing the use of the corresponding technology and ensures that this technology is acceptable, purposeful, usable, safe, and effective [As the next and central step in the UCD process, a usability study was conducted. Usability is defined as “the extent to which a product can be used by specific users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use” (ISO 924-11) [