Needs assessment (language teaching) ; Sprachandragogik; Volkshochschule; Adult language teaching ; DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; Fernsehkurs; Rundfunkunterricht; Schulfunk; Educational broadcast ; Pragmatische Kompetenz; Pragmatic competence; Communicative competence ; Second language acquisition (pragm.) ; Zweitspracherwerb (pragm.) ; Interactionist hypothesis (second language acquisition) ; Conversational analysis (second language acquisition) ; German