Due to the increasing migration movements, language mediation in schools and language-conscious subject teaching are more important than ever. This volume explains the fundamentals of second language acquisition and discusses concepts such as multilingualism and interculturality. Additional chapters focus on the teaching of language skills, the position of German as a second language in the school system, as well as language assessments and language support in early childhood education. Explanations of German from a contrastive perspective conclude the volume. It features a two-color layout, with definitions and illustrations.