Canada ; Bundesrepublik Deutschland; Federal Republic of Germany; BRD; Germany ; Language teaching ; Second language acquisition (language teaching) ; Zweitspracherwerb (Unterricht) ; Foreign language teaching ; DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; English as a second language; ESL; TESOL ; Multilingualism; Polylingualism; Plurilingualism ; Auswanderer; Emigrants; Migrant; Aussiedler; Gastarbeiter; Arbeitsmigranten; Immigrants/Emigrants ; Transfer (languages in contact) ; Adstratum language; Adstratsprache; Interference ; Dreisprachige Erziehung; Trilingual education; Multilingual education ; Second language acquisition (psycholing.) ; Third language acquisition ; German ; English ; French
