La Colinière High School has been opening to the international level since three years. Seven teachers have been certified for teaching their subjects in English (“DNL” certification). Many teachers already use educational material in English. But language proficiency remains a hindrance to further practice. Moreover, the current system does not allow the establishment to offer scientific lessons in English for every student. The steering group learned about the opportunity offered by the ERASMUS+ program during a meeting arranged by the regional education authority in December 2014. Early January, the information was published with a call for applications targeting teachers in science and technology subjects. Thirteen teachers in science and technology with various levels in English are willing to pursue the following objectives : - to acquire better proficiency in English in order to be able to use it fluently during activities, both for teachers and pupils - to develop English-based partnerships with other European high schools - to learn about other educational systems, share expertise and diversify teaching practices Individual review made by the teachers about the use of English language in their practice allowed to define the needs and expectations of the participants to this project. The activities scheduled during the mobility phase are language and conversation lessons (including an English level test at the beginning and at the end of the mobility phase), visits of British school establishments, development of documents and educational resources. The benefits of this training as well as the developed resources will be reinvested after this mobility, in a long-lasting way. International partnerships will also be established during the following years. Some of the teachers will get a DNL certification. The expected impacts and results are an improved level in English for teachers and students, a generalization of opportunities for school exchanges between European nationals. This will allow students to practice English, an essential language for any higher education curriculum. Besides, an increase in the number of teachers (in scientific or non scientific subjects) involved in ERASMUS+ project is expected in the following 2 years thanks to a new mobility project. On the long term, the expected outcome of this project is a greater international openness for the establishment, a better adaptation of professional skills to the new needs of academic programs, and stronger chances of success for our students in their future paths.