Glottodidaktik; Lehrforschung; Pädagogische Linguistik; Pedagogical linguistics; Language teaching research ; Sampling; Language corpus; Sprachkorpus; Datensammlung; Data collection; Textkorpus (method.) ; Text corpus (method.) ; Corpus linguistics ; Needs assessment (method.) ; Techniques (in research) ; Research techniques ; Dispositivanalyse; Dispositive analysis; Critical discourse analysis