DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; Swiss German (second language teaching) ; Kulturvergleich; Language and culture ; Gastarbeiterkinder; Migrant workers (children of) ; Auswanderer (Kinder) ; Emigrants' children; Migrantenkinder; Aussiedler (Kinder) ; Kinder mit Migrationshintergrund; Immigrants'/Emigrants' children ; German