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OBJECTIVE As the first part of a comprehensive research endeavor to identify the words that U.S. students are likely to encounter in grades K-12, this study involved analyzing four current, best-selling, elementary core reading programs. From this analysis, frequency lists for words and word families appearing in these programs were developed. These frequency lists are available at metametricsinc.com/american-school-english for researchers, publishers, and educators. METHODS Data Sources: Baseddoi:10.1086/701653 fatcat:byj57ksdabfiljnvnilwkafysm