Reviews ; Needs assessment (language teaching) ; DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; English as a second language; ESL; TESOL ; Lehrgrammatik; Unterrichtsgrammatik; Pädagogische Grammatik; Didaktische Grammatik; Schulgrammatik; Pedagogic grammar; Grammar (teaching of) ; Glottodidaktik; Lehrforschung; Pädagogische Linguistik; Pedagogical linguistics; Language teaching research ; Sampling; Language corpus; Sprachkorpus; Datensammlung; Data collection; Textkorpus (method.) ; Text corpus (method.) ; Corpus linguistics ; BNC ; COCA ; Initialwort; Acronym ; Inhaltswort; Content word; Open class word; Closed class word; Function word/Content word ; Grundwortschatz; Aufbauwortschatz; General Service List; Basic vocabulary ; German ; English