The ChArGED solution will be developed with iterative end-users representatives’ engagement during analysis, design and development. Further users at least 150 real building occupants in three (3) countries (50 in each building- validation country) will be engaged for deployment and validation. This will take place in a series of tests sessions in two public office buildings with different starting point (with/without energy saving systems) and one cultural building (national museum). These cover the needed building’s usage, geographical and cultural diversity to ensure scalability of the results in other domains.