Sampling; Language corpus; Sprachkorpus; Datensammlung; Data collection; Textkorpus (method.) ; Text corpus (method.) ; Corpus linguistics ; Frequency (synt.) ; Techniques (in research) ; Research techniques ; Zweitspracherwerb (Textproduktion) ; Second language acquisition (text production) ; Text production (second language acquisition) ; Complexity (synt.) ; Evaluation criterion (text.) ; Lesbarkeit (psycholing.) ; Komplexität (text.) ; Complexity (text.) ; Readability ; German