The academic work centres on the question of how foreign language lessons can make productive use of pupils' linguistic resources. Jules Bündgens-Kosten examines in particular how multilingual approaches can be designed in English lessons at primary school and in years 5 and 6 in order to effectively support learning processes. The focus is not only on traditional teaching and learning materials, but also on digital formats and hybrid learning environments.

Another focus is on reading and writing in digital spaces. Children and young people today gain numerous linguistic experiences online - for example in social media, in digital communities or in AI-influenced communication environments. Jules Bündgens-Kosten explores the question of how such experiences can be made fruitful for school learning processes and what skills pupils need in order to navigate digital discourses safely, critically and independently.

Jules Bündgens-Kosten is also developing participatory research and development approaches in English didactics. The aim is to test and further develop teaching materials and learning concepts together with various participants - such as teachers, pupils and other educational stakeholders. Particular attention is paid to the perspectives of groups that are often marginalised or disadvantaged in the education system.