Second language acquisition (language teaching) ; Zweitspracherwerb (Unterricht) ; Foreign language teaching ; FLES ; Bilingual method ; Lernziel; Backward design (language teaching) ; Objectives (in language teaching) ; Classroom communication; Instructional communication ; Sprachenpolitik; Language management; Language politics ; Foreign language teaching policy ; Multilingualism; Polylingualism; Plurilingualism ; Bilingual education ; Case study (second language acquisition)