A multi-centre quasi experimental controlled pilot study will be undertaken to evaluate a 6 months ICT based intervention, the PEGASO System, to promote healthy habits among adolescents. The study will include adolescents from four sites: England (UK), Scotland (UK), Lombardy (Italy) and Catalonia (Spain). Participants in he intervention group will test the PEGASO ecosystem from October 2016 to March 2017 while those in the comparative group will not have access to the PEGASO ecosystem. The sample selection will be carried out in two stages: in the first phase, schools with medium-low socioeconomic level will be selected by convenience sampling; in the second phase classes will be selected for participation in each school in agreement with schools principals/ head teachers. A total of 525 adolescents from participating high schools will be asked to participate in the study as intervention or comparative group, in a 2:1 ratio. Consequently, approximately, 350 participants of the four pilot sites will be testing the PEGASO platform, whilst 175 will be the comparative group. Decisions about appropriate sample sizes were underpinned by a range of considerations, including the study's aims, operational constraints, the accuracy of the survey estimates and costs.