The proposed Guardian Angel application was firstly tested by 5 experts, when the application was not at its final stage, in order to examine easiness of use and identify potential areas of difficulties and errors and propose improvements. More specifically, they interacted with the functions and interfaces of the software/hardware. Real life scenarios (test cases) were used to examine whether an average user could follow the process and complete all the possible tasks efficiently and effectively. An overall positive feedback was given by the experts, as nearly all agreed that the information presented on the screen was simple. While most of them seemed to be fully satisfied, or at least to some extent, with issues of data privacy, system personalization and consistency of users’ actions to system output, a few concerns were noted on the clarity of information and system actions visibility. The areas requiring further work concern the support of the system in case of error messages, with clear explanations provided to the user on the problem and on what is expected of him/her.