SIT ; Pragmatische Kompetenz; Pragmatic competence; Communicative competence ; Metalinguistic awareness; Phonologische Bewusstheit; Phonological awareness; Focus on form (language teaching) ; Sprachbewusstsein; Linguistic awareness ; Sociolinguistics ; Sprachbewahrung; Ethnolinguistic vitality; Vitality, ethnolinguistic; Sprachwechsel; Language shift; Heritage language; Language maintenance ; Performanz; Performance; Knowledge (linguistic) ; Wissen (sprachliches) ; Competence/Performance ; Sprachkreativität; Creativity; Kreativität; Linguistic creativity ; Second language acquisition (psycholing.) ; Critical period (second language acquisition) ; Alter (Einfluss auf Zweitspracherwerb) ; Age (influence on second language acquisition) ; Ultimate attainment (second language acquisition) ; Near-native competence (second language acquisition) ; AoA; Age of acquisition (second language acquisition) ; Sensitive period (second language acquisition) ; Speech intelligibility (second language acquisition)