While Content and Language Integrated Learning (CLIL) has received a considerable amount of research interest lately, its increasing popularity as an approach to teaching content subjects in a foreign language requires concerted investigation that reflects and recognises its fundamentally contextualised nature. In this contribution, we sketch various tasks that require localised, often action research, covering a range of areas highly relevant to CLIL realities, but so far underrepresented in the literature. These are, firstly, policy issues, comprising policy statements as well as stakeholders' perceptions of CLIL and its success; secondly, classroom discourse as the prime site for the investigation of CLIL practices and their implications for the learning process; and, thirdly, classroom pedagogy, with the focus on potential differences between CLIL and non-CLIL settings.