The project called “Today, you imagine the European city of tomorrow—Ideas to build the future,” has involved a strategic partnership between four middle schools: Collège EPB - Ernest Perrier de la Bathie in Ugine in France), Şcoala Gimnazialǎ in Gâdinţi (Romania), Academic Lyudmil Stoyanov Ezikova Gimnazia in Blagoevgrad (Bulgaria), and Institut Carles Vallbona in Granollers (Spain) -, along with three associations: Le Grand Bivouac (France), the Savoy Conseil d’Architecture, d’Urbanisme et d’Environnement (France) and the cooperative society Andelssamfundet in Hjorshøj (Denmark).The project has lastes thirty-six months, divided into nine thematic three-month periods. It has enabled students to imagine and create together a virtual future city which, according to the EDD-SI measures, tackles the problematics of sustainable development—whether environmental, economical, or social ones.Based on educational cooperation, transdisciplinary activities and an exchange of innovative educational methods, this collective reflection has addressed topics such as: how to make the most of natural resources, and how to assess the ecological impact of infrastructures. It has also addressed social diversity and the citizen’s role in such a European city, as well as the factors that improve quality of life together.Out of the four middle schools that took part in the project, three were situated far from places where culture thrives. Therefore, the project has aimed and hopefully succeeded at developing students’ ambition by opening them to the world, but also urging them to grow autonomous and responsible by putting them at the heart of all propositions and letting them play a big part in the evolution of our societies.The “European city of tomorrow” has grown in a collective digital working space, fed and improved by each participant, who have uploaded the results of educational activities led in class, the conclusions of students’ reflections and their ensuing practical propositions.During the nine three-month periods,six five-day cycles of transdisciplinary activities have been organized. Those have enabled students, teachers and members of associations to continue their work, to meet, and to study local resources linked to previously chosen themes.During those cycles, a variety of events have been offered to a wide public. Moreover, some activities have resulted in intellectual productions which have helped spread the methods and achievements beyond the circle of the partners of the project. Among those events, there has been public show-like lectures, prepared and hosted by the students. The shows have been filmed, subtitled and gathered as a six-DVD boxset distributed through each partner’s own distribution channels.Besides, two brochures have been printed at the end of those three years : “We young citizens of tomorrow and our ideas to build the future,” and “A guide for a school involved in sustainable development.” They've gathered and summed up the ideas and methods developed through our collective European project.Indeed, our goal was not only to have a real impact on the schools and associations in this partnership but also to enable organizations to engage in sustainable development through a coherent approach, and to give the youth the power to invent their future in a world which is more respectful of the environment.APPENDICEShttps://drive.google.com/drive/u/1/folders/10GTrhkzYI81XRHHSB1gUvUdK0DR1sogW?ogsrc=32