Effects of CLIL on second language learning: Disentangling selection, preparation, and CLIL-effects

The positive effects of Content and Language Integrated Learning (CLIL) on the development of students’ foreign language skills may have been overestimated by previous studies, since most studies failed to consider selection and preparation effects appropriately. Therefore, the present study used complete survey data from a 2002–2007 cohort to investigate English skill development of N = 385 German CLIL and N = 5,578 non-CLIL grammar school...