Europe ; Language testing ; Evaluation criterion (language teaching) ; Educational policy ; DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; GERS; CEFR; Quadro Comune Europeo di Riferimento; Common European Framework of Reference for Languages ; Self-directed learning; Autonomes Lernen; Self-teaching ; Griechisch; Greek (modern) ; Modern Greek ; German