How we proceededAs a first step, we identified some subjects that were common to the curricula of the differentparticipating classes in each country. We then split the subjects in two groups: on one hand biologyand physics where all teachers were supposed to teach the same content and on the other hand thesustainability theme where every teacher was free to choose his subject. After having taught asubject to a class, we evaluated the scientific knowledge acquired as well as the feelings of thestudents about the teaching unit. At the first students meeting in Luxemburg, students of eachcountry made a brief presentation about the subjects taught.During the second school year, we had to do some slight modifications to the common themes, butotherwise followed the same guidelines as before. The second students meeting in Valencia focusedaround a workshop on sustainable development. International student groups were asked tocommunicate in order to elaborate a common presentation on a given theme.While doing this with our classes, we created a website and a Facebook site, so that teachers andstudents would have a means of communication outside the meetings. The Facebook site turns outto be quite successful and has some of the participants regularly interacting. The website isaccessible to everybody and is supposed to give fellow teachers some useful ideas if they want to usesome of the material published there.At the final meeting in Prato, we presented the final results, essentially the statistics concerning thestudents feelings about CLIL in English, the results of the workshop in Valencia and the teaching unitspublished on the website.