“Cooperative Teaching and Learning to change behaviour: Ecological Footprint at school” is the name of this project which involves three schools, IES Val Miñor (Spain) in the role of coordinator, the Vilkaviskio r. Sudavos pagrindine morykla (Lithuania) and the Istituto Comprensivo Novara di Sicilia (Italy), in a collaborative, multi-lingual and transnational innovative experience.Goals:1. Problem-based educational innovation from the start, which promotes autonomy and active roles in learning as well as making it possible to investigate, discover, draw and share conclusions within a framework of students teaching one another.2. Promotion of sustainability by carrying out the analysis of those natural resources necessary to maintain the students’, as well as the schools’, standard of life and the impact of it all on our planet.3. Training students to become critical citizens, responsible and sustainability-aware consumers.4. Designing teaching materials to sustain the experience and enroll new schools which might be willing to track their own ecological footprint, while strengthening basic skills, such as the use of ICTs, the English language as a working tool, learning to learn, and the scientific method.The 12-15-year-old participant students, of very different profiles (curriculum, language skills, age, cultural context) have managed, through cooperation, to put together a common result to share with the school community.Activities:1. Initial transnational teacher meeting in order to coordinate activities, establish the focus of the guidelines to be elaborated, define competences and evaluation criteria and design materials.2. Short-term training activities for students, namely problem-based learning experiences carried out simultaneously in the three schools, each of them involving between 30-60 students and 2-6 teachers per school.Each activity addressed a problem, with the students looking for a solution, which would later be the basis for the short-term exchanges, and giving it shape (the outcome is on display on the project’s website).List of activities: Learning about Natural Resources (C1), Calculating our Impact: My Ecological Footprint (C3), What is the Surface of The Earth supporting my school activity? Preparing the future (C5).3. Short-term student exchanges, during which students took part in group training activities, by means of an active methodology of cooperative work, in the transnational context. Students discussed the results of these activities and integrated them into common materials (available on the project’s website).List of activities: Learning about Natural Resources: The Ecological Footprint (C2), What do we do with our Planet? Global Footprint (C4), Our use of the Planet: The Footprint of our school. Materials for the Future (C6).4. Other events and dissemination. All the activities, and their results, were presented to the local and educational community as well as to the media. Besides, an exhibition of the materials that graphically reports their conclusions and proposals was set up by the students themselves. The project website displays the work carried out, step by step.Intangibles: Promotion of self-initiative and participation; improvement of linguistic competence; improvement of performance and motivation; strengthening of multidisciplinary work and educational innovation; promotion of a European and sustainable awareness; changes in consumer behaviour and habits.Materials: Teacher and student guide including 40 didactic units specially designed for developing the activities; support teaching materials and project website; a mobile app for working out ecological footprint; brochures for the project dissemination; exhibition of project materials prepared by the students; presentations, brochures, reports on consumption of resources and reduction measures for families, too; reports and suggestions for ecological footprint tracking at schools. All of the stuff is displayed and available on the participant schools’ websites and on the project website http://coteachinglearning.eu/ The impact has been achieved through:1. A significant breakthrough in collaborative work, in three schools with different realities, that has finally involved the whole school community.2. The exchange of results among more than 1200 students.3. The presentation of results to the families, citizens, other schools and municipalities.4. Web availability of the finished project along with a guide and all the materials.In the long term, the sustainability of this experience will be possible through public access to the guide and the materials supporting it from the web http://coteachinglearning.eu/