When they take on a foreign language assistant, host schools gain additional support not only for foreign language lessons but also for teaching subjects using a foreign language as the medium of instruction (immersion or bilingual instruction). But not only that: projects and topic weeks become more authentic. In addition, the teaching assistant also makes a contribution to an international learning environment in Swiss host schools.The advantages for the teachers of the host schools are manifold. The teaching assistant takes part in the lesson and makes teaching in split classes and groups easier. In this way, different levels of learning can be supported and balanced in a targeted way.The assistant brings authentic materials with him/her and, with current topics from his/her country of origin, builds bridges with the world in which the pupils live. This motivates the pupils to make active use of the language and breaks down any inhibitions they have about speaking it; both have a positive effect on the results of final examinations and international exams.