The "Sustainable Islands" (SusI) project involved six islands of the EU and partners: Cyprus, Marie Galante (Guadeloupe, France), Iceland, Sardinia (Italy), Terceira (Azores, Portugal) and Gran Canaria (Canary Islands, Spain). The main aim consisted of reflecting and cooperating on the three pillars of sustainability (society, economy and environment) through four practical axes from an island perspective (water, waste, food sovereignty and transports), so that a better integration within the EU could be achieved. Island’s identity (opposite to mainland’s identity) arose as an important subject to deal with.The implementation of the project was structured in six phases:During Phase I and Phase II, we reflected on how we saw ourselves and each other, so that stereotypes and particularities about islands were discussed; and we also explored how we could travel to the other islands and its cost through virtual travel agencies. At these early stages, the “syllabus” of the project was established: a glossary on sustainability in English and national languages; an exam on this glossary; action protocols for families, students and teachers; the commitment to plant at least one SusI “forest” on each island at each meeting; the commitment to measure the ecological footprint at school/family level.During Phase III, food sovereignty was discussed and we explored if islands produced enough food for their inhabitants, reflected on some food goods which came from abroad and analysed why the production of food was so expensive on some islands.Phase IV and V were devoted to water, waste and energy management. An intergenerational dialogue was enhanced, as well as positive habits regarding sustainable consumption in general.Finally, Phase VI was dedicated to disseminate the results and activities developed by the SusI Project.NB. THE NUMBERING OF RESULTS RELATES TO THAT OF THE FINAL REPORT.