Second language acquisition (language teaching) ; Zweitspracherwerb (Unterricht) ; Foreign language teaching ; Barrierefreiheit; Communication access; Communication barrier; Exklusion (Soziolinguistik) ; Exclusion (sociolinguistics) ; No Child Left Behind Act; Inclusion/Exclusion (sociolinguistics) ; Triggering (language acquisition) ; Language exposure (language acquisition) ; Input hypothesis; Input (language acquisition) ; Second language acquisition (psycholing.) ; Case study (second language acquisition) ; English