What makes an ISSOS summer different? The people your teenager will share it with. Every summer, our international summer schools welcome students aged 13–18 from over 100 countries. We limit places to no more than 10% from any one nationality, so no single group dominates and every student is encouraged to mix. Native and non-native English speakers learn, live and explore side by side, every day. The result is friendships that cross borders and last long after the summer ends. 👉 Discover more about ISSOS Summer 2027.