The participants are members of the Erasmus Club, a diverse group of eighth-grade middle school students who, for two years, have been participating in afternoon activities, participating in Etwinning projects on the 2030 Agenda and helping to host international mobility groups at our school. Some of them have good language skills in English and French. They have completed preparatory activities for the mobility using a CLIL approach. Through afternoon team-building sessions, they have developed strong collaboration skills.