DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; Classroom communication; Instructional communication ; Metalinguistic awareness (in children) ; Phonics (teaching of) ; Phonologische Bewusstheit (bei Kindern) ; Phonological awareness (in children) ; Focus on form (language teaching) ; Sprachbewusstsein (bei Kindern) ; Linguistic awareness (in children) ; Dual language acquisition; Bimodal language acquisition; Spracherwerb (biling.) ; Language acquisition (biling.) ; Bilingual language acquisition ; Multilingualism; Polylingualism; Plurilingualism ; Bilingual education ; German