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Although literacy achievement has improved in Chile, adolescents' underperformance in reading comprehension is still a serious concern. In English, core academic-language skills (CALS) have been found to significantly predict reading comprehension, even controlling for academic vocabulary knowledge. CALS are high-utility language skills that support reading comprehension across school content areas. Guided by an operational definition of Spanish CALS (S-CALS), three goals drove this study: to develop two psychometrically reliable tests, the S-CALS Instrument and the Spanish Academic Vocabulary (S-AVoc) Test; to explore the dimensionality of core academic-language proficiencies, as measured by these two tests; and to examine the contribution of core academic-language proficiencies to reading comprehension. A cross-sectional sample of 810 Chilean students (grades 4-8) participated in four assessments that measured standardized reading comprehension, word-reading fluency, Spanish academic vocabulary, and S-CALS. Using classical test theory and item response theory analyses, results yielded robust reliability evidence for both instruments. Consistent with prior research, S-CALS and academic vocabulary scores displayed upward trends in higher grades yet considerable within-grade variability. Confirmatory factor analysis revealed that S-CALS and S-AVoc were best conceptualized as part of a higher order construct, the Spanish core academic-language and vocabulary skills (S-CALVS). The aggregated S-CALVS scores predicted reading comprehension, beyond the contribution of grade, school factors, and word-reading fluency. This study advances our scientific understanding of CALS as relevant for adolescent literacy beyond the English language. The high-utility school-relevant language and vocabulary skills offer promising tools to inform and evaluate innovative reading comprehension interventions for Spanish-speaking adolescents.

This study focuses on connectives, linguistic devices that signal relations between ideas. Connective knowledge varies widely across grades and is known to support reading comprehension and school writing. Despite the important role that connective knowledge plays in reading and writing, few resources exist to support teachers in understanding which connectives to prioritize in Spanish literacy instruction. In this study we combined a secondary analysis of midadolescents' connective assessment data (810 students in grades 4–8) with a corpus linguistics frequency analysis of connectives in Chilean national science and social studies textbooks (1,079,593 total words), with the goal of generating a pedagogically relevant tool to support the instruction of connectives in Spanish literacy across content areas. To generate the Connective Frequency Bands Tool, we first examined the role of grade and connective type in midadolescents' connective knowledge. Secondly, we examined associations between students' knowledge and textual frequencies across content areas for each connective included in the assessment. Finally, informed by midadolescents' connective knowledge and by the corpus linguistics analysis of science and social studies textbooks from grades 1–8, we generated the Connective Frequency Bands Tool listing connectives frequencies by grade, connective type, and content area. [ABSTRACT FROM AUTHOR]