GRTR ; Reading instruction (second language) ; Spracherwerb (Schriftsprache) ; Language acquisition (written language) ; Kindersprache (Schriftsprache) ; Child language (written language) ; Schrifterwerb (psycholing.) ; Written language acquisition (psycholing.) ; Strukturgleichungsmodell; Structural equation modeling; Mixed methods research; Q-matrix (methodol.) ; Fusion model (methodol.) ; Regression analysis; Regressionsanalyse; Factor analysis ; Futurologie (linguistische) ; Prognosis (language change) ; Prognose (Sprachwandel) ; Futurology (linguistic) ; Voraussage (linguistische) ; Prediction (linguistic) ; Metalinguistic awareness (in children) ; Phonics (teaching of) ; Phonologische Bewusstheit (bei Kindern) ; Phonological awareness (in children) ; Focus on form (language teaching) ; Sprachbewusstsein (bei Kindern) ; Linguistic awareness (in children) ; Dual language acquisition; Bimodal language acquisition; Spracherwerb (biling.) ; Language acquisition (biling.) ; Bilingual language acquisition ; Aetiology; Anamnese; Diffentialdiagnose; Differential diagnosis; Symptom; Syndrome; Prognosis (pathol.) ; Biomarker; Diagnosis ; Second language acquisition in children; Kindlicher Zweitspracherwerb; Child second language acquisition ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English ; Chicano; Puertoricans; USA (span. Sprache in den) ; Mexican American Spanish; USA (Spanish language in the) ; Spanglish; Inglañol; Tex-Mex; Spanish in the USA