So far, the German-language book market has primarily featured handbooks on foreign language teaching or didactics for individual target languages. However, these do not address the didactics of multilingualism or multiculturalism, which complement the teaching of German as a foreign language, English, French, and others.

This handbook, containing more than 120 articles, provides a comprehensive overview of teaching across languages and cultures in various research areas. It covers a diverse range of topics, including linguistic and cultural aspects, language policies, multilingual and foreign language concepts, didactics of multilingualism and multiculturalism, intercultural learning, the Common European Framework of Reference for Languages (CEFR), the Companion Volume, REPA, teaching multilingualism and multiculturalism, first, second, and multilingual acquisition, intercomprehension didactics for Romance, Slavic, and Germanic languages, late language learning, English and multilingualism, multilingualism in real-world contexts, heritage languages, bilingual subject teaching, autochthonous multilingualism, migration and multilingualism, identity, language education for children, and teaching multilingual learning groups.