Lycée Elie Faure in Lormont (Gironde, France) is a public institution of secondary and higher education with 1300 students. International openness is a major part of our project. We have "Section européenne" classes in each grade with intensive English or German language teaching and twinning with schools in Italy and Germany. The establishment wishes to develop new partnerships and European projects involving, in particular, students of the English "Section européenne" (opened in September 2013). This objective requires to train the teachers working on C.L.I.L. (Content and Language Integrated Learning). A first school’s Learning Mobility application for a management teacher was accepted in 2014. The 2015 Mobility project involves Mr Vicard, a Physics and Chemistry teacher working in CL.I.L.. He wishes to develop his skills and to become more closely involved in our European development plan. The project concerns training activities in the UK. The host organisation is I.S.P. (International Study Programmes). The “C.L.I.L. – Science, Maths & Technical Subjects” two week training course in Cheltenham allowed Mr Vicard to develop his English language skills, his knowledge of European education systems and his capacities to lead multidisciplinary and European projects and to apply innovative practical teaching methods. His way of seeing the teaching his subject using a foreign language has changed substantially. CLIL-Learning is not only for a limited number of volunteer students but can be addressed to all student profiles. After his training course, Mr Vicard presented to his colleagues the ERASMUS Program for staff mobility and hids own experience. Since, several teachers wanted to get involved in teaching in CLIL and they volunteer for a Mobility Project in 2016-2017. The establishment benefited from this mobility project within the framework of its European Development Plan. Indeed, more teachers are involved in the internationalisation and know the Erasmus Program for school. Two teachers have been already trained to teach with more efficiency in C.L.I.L. and their students of European Section benefit from their skills. Other teachers' involvement will allow more ambitious cooperative projects with a multidisciplinary dimension.