Sustainable Development project (2023 -1-ES01-KA121) was initiated by our high school in collaboration with 4 different european schools: Greece (Geniko LIikio Hortiati in Thessaloniki) , Slovakia (Základná škola), and Germany (Max-Planck-Gymnasium in Ludwigshafen). Throughout 2023/24 school year we carried out 4 mobilities.