Foreign language teaching policy ; Dreisprachige Erziehung; Trilingual education; Multilingual education ; Third language acquisition ; Switzerland (German language in) ; Schweiz (dt. Sprache in der) ; Deutsch in der Schweiz; German in Switzerland; Swiss German ; Schweiz (engl. Sprache in der) ; Switzerland (English language in) ; English in Switzerland ; Schweiz (fr. Sprache in der) ; Switzerland (French language in) ; French in Switzerland