Language testing ; Evaluation criterion (language testing) ; Evaluation criterion (language teaching) ; Second language acquisition (language teaching) ; Zweitspracherwerb (Unterricht) ; Foreign language teaching ; GERS; CEFR; Quadro Comune Europeo di Riferimento; Common European Framework of Reference for Languages ; Gebärdensprache (Zweitspracherwerb) ; Sign language (second language acquisition) ; Sign language (language teaching) ; Gebärdensprache (Sprachunterricht) ; Second language acquisition (sign language)