Evaluation criterion (language teaching) ; Lehrplan; Syllabus; Curriculum research ; Kommunikationstechnologie; Informationstechnologie; Information technology; Informationstechnik; ICT; Communication technology ; Sprachenpolitik; Language management; Language politics ; Sprachbewahrung; Ethnolinguistic vitality; Vitality, ethnolinguistic; Sprachwechsel; Language shift; Heritage language; Language maintenance ; Bilingual education ; Singapur (engl. Sprache in) ; Singapore (English language in) ; Singlish; English in Singapore ; Mandarin; Kantonesisch; Cantonese; Putonghua; Sinitic; Hakka; Yue; Chinese