"Content and language integrated learning as a guarantee of success" is an interdisciplinary project that gives the students the opportunity to acquire mathematical, scientific and IT competences while improving the English language. The project involves the cooperation of the SP3 with the FEDAK Sant Andreu school in Barcelona. The goal of the project is to help students from both schools discover and explore the fascinating world of nature by carrying out experiments, conducting their own research and ecological projects, and then sharing the results of their work with foreign partners. Not only communication between project participants in English (email exchange, videoconferences), but also joint creation of dictionaries (Polish-English-Spanish) in the field of various scientific and mathematical problems will allow students of both schools to develop their vocabulary in a foreign language.