Needs assessment (language teaching) ; Technical language (teaching of) ; Français fonctionnel; Teaching of technical language ; English as a second language; ESL; TESOL ; Subtractive bilingualism; Semilingualism ; Auswanderer; Emigrants; Migrant; Aussiedler; Gastarbeiter; Arbeitsmigranten; Immigrants/Emigrants ; Sprachbewahrung; Ethnolinguistic vitality; Vitality, ethnolinguistic; Sprachwechsel; Language shift; Heritage language; Language maintenance ; Bilingual education ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English