Bundesrepublik Deutschland; Federal Republic of Germany; BRD; Germany ; Computer (Sprachunterricht) ; Computer (language teaching) ; CALL; E-learning; Mobile-assisted language learning; MALL ; English as a second language; ESL; TESOL ; Lehrerausbildung; Teacher training; Lehrerfortbildung; In-service teacher training; Teacher education ; Lehrplan; Instructional advice ; Concordance (computational linguistics) ; Sampling; Language corpus; Sprachkorpus; Datensammlung; Data collection; Textkorpus (method.) ; Text corpus (method.) ; Corpus linguistics ; Case study