Abstract

Despite a longstanding awareness of academic language as a pedagogically relevant research area, the construct of academic language proficiency, understood as a more comprehensive set of skills than just academic vocabulary, has remained vaguely specified. In this study, we explore a more inclusive operationalization of an academic language proficiency construct, Core Academic Language Skills (CALS). CALS refers to a constellation of high-utility language skills hypothesized to support reading comprehension across school content areas. Using the CALS-I, a theoretically grounded and psychometrically robust innovative instrument, we first examined the variability in students' CALS by grade, English proficiency designation, and socioeconomic status (SES). Then, we examined the contribution of CALS to reading comprehension using academic vocabulary knowledge, word reading fluency, and socio- demographic factors as covariates. A linguistically and socioeconomically diverse cross- sectional sample of 218 students (grades 4-6) participated in four assessments: the CALS-I, a standardized reading comprehension assessment (GMRT), an academic vocabulary test (VAT), and a word reading fluency test (TOSWRF). GLM analysis of variance revealed that CALS differed significantly by grade, English proficiency designation, and SES, with students in higher grades, English proficient students, and those from higher SES backgrounds displaying higher scores, on average. Hierarchical multiple regression analyses identified CALS as an independent predictor of reading comprehension, even after controlling for academic vocabulary knowledge, word reading fluency, and socio-demographic factors. By specifying a set of language skills associated with reading comprehension, this study advances our understanding of school- relevant language skills, making them more visible for researchers and educators. ACADEMIC LANGUAGE & READING COMPREHENSION 3 Beyond vocabulary: Exploring cross-disciplinary academic language proficiency and its association with reading comprehension

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