This paper discussed the trajectories followed by three educational centres -the Eduard Fontseré Secondary School, the Solc Nou vocational training centre and the Xaloc Special Needs School-in order to offer all their students at least one servicelearning experience every academic year.In all three cases, mass implementation of the service-learning methodology has led to profound changes in their centres, which have allowed them to improve their academic results and increase teacher satisfaction.Using ethnographic methods -interviews, observation and analysis of documentation-this paper discusses the key elements that are involved in successful implementation of service-learning for all students in educational centres.