This study examined the effect of a quasi‐experimental project on fifth grade English learners' achievement in state‐mandated standards‐based science and English reading assessment. A total of 166 treatment students and 80 comparison students from four randomized intermediate schools participated in the current project. The intervention consisted of on‐going professional development and specific instructional science lessons with inquiry‐based learning, direct and explicit vocabulary instruction, integration of reading and writing, and enrichment components including integration of technology, take‐home science activities, and university scientists mentoring. Results suggested a significant and positive intervention effect in favor of the treatment students as reflected in higher performance in district‐wide curriculum‐based tests of science and reading and standardized tests of oral reading fluency. © 2012 Wiley Periodicals, Inc. J Res Sci Teach 49: 987–1011, 2012

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The authors examined the effectiveness of a 2-year (kindergarten and first grade) oral English intervention provided to 534 Hispanic English-language learners in transitional bilingual education (TBE) and structured English immersion (SEI) programs. Using latent growth modeling, the authors compared instructional programs in relation to growth trajectories and rates in academic English oracy. The findings revealed that students in all four programs (treatment TBE, control TBE, treatment SEI, and control SEI) improved significantly ( p < .05) in a linear pattern over 2 years, and students receiving the intervention developed at a faster rate than those receiving typical instruction ( p < .05, effect sizes >0.46). The authors concluded that (a) first-language instruction did not impede the learning of a second language, and (b) enhancements and best practices in TBE and SEI programs are needed to accelerate oral English acquisition to remove the initial disadvantage of low levels of English proficiency.

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