This book will be of interest to a broad readership, regardless of whether they have a background in sociolinguistics, functional linguistics or genre theories. It presents an accessible “meta-language” (i.e. a language for talking about language) that is workable and usable for teachers and researchers from both language and content backgrounds, thus facilitating collaboration across content and language subject panels. Chapters 1 to 3 lay the theoretical foundation of this common meta-language by critically reviewing, systematically presenting and integrating key theoretical resources for teachers and researchers in this field. In turn, Chapters 4 to 7 focus on issues in pedagogy and assessment, and on school-based approaches to LAC and CLIL, drawing on both research studies and the experiences of front-line teachers and school administrators. Chapter 8 provides a critical and reflexive angle on the field by asking difficult questions regarding how LAC and CLIL are often situated in contexts characterized by inequality of access to the linguistic and cultural capitals, where the local languages of the students are usually neglected or viewed unfavourably in relation to the L2 in mainstream society, and where teachers are usually positioned as recipients of knowledge rather than makers of knowledge. In closing, Chapter 9 reviews the state of the art in the field and proposes directions for future inquiry.