Glottodidaktik; Lehrforschung; Pädagogische Linguistik; Pedagogical linguistics; Language teaching research ; Sampling; Language corpus; Sprachkorpus; Datensammlung; Data collection; Textkorpus (method.) ; Text corpus (method.) ; Corpus linguistics ; CEDEL2 ; Validity (method.) ; Evaluation criterion (method.) ; Second language acquisition (psycholing.) ; Spanish