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Vaughn, Sharon; Martinez, Leticia R.; Linan-Thompson, Sylvia; Reutebuch, Colleen K.; Carlson, Coleen D.; Francis, David J. – Journal of Research on Educational Effectiveness, 2009
Two experimental studies to improve vocabulary knowledge and comprehension were conducted in 7th-grade social studies classes with English language learners (ELLs). Two different nonoverlapping samples of classes of 7th-grade students (N = 381 and N = 507) were randomly assigned at the classroom (i.e., section) level to a social studies…
Descriptors: Vocabulary, Second Language Learning, Vocabulary Development, Social Studies