Language testing ; Evaluation criterion (language teaching) ; Glottodidaktik; Lehrforschung; Pädagogische Linguistik; Pedagogical linguistics; Language teaching research ; Instruction (medium of) ; Medium of instruction ; Sprachenwahl; Language choice; Diglossia ; Speech perception (second language acquisition) ; Sprachperzeption (Zweitspracherwerb) ; Speech production/speech perception (second language acquisition) ; German ; English