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As part of a 5-year professional development intervention aimed at improving science and literacy achievement of English language learning (ELL) students in urban elementary schools, this study examined fourth-grade students' science achievement across a 3-year (2005)(2006)(2007)(2008) implementation of our professional development intervention consisting of curriculum units and teacher workshops. Analyses were conducted with 1,758 students at six schools that participated in the intervention. The results of this study reveal several central findings. First, students in the treatment group displayed a statistically significant increase in science achievement from pre-to posttest. Second, there was

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