Using Large-Scale Assessments to Evaluate the Effectiveness of School Library Programs in California

Abstract

This California study examined the relationship between the presence of school libraries, as defined by credentialed staffing, and student achievement, as measured by both criterionreferenced and norm-referenced assessments in both English-language arts and mathematics. Using the California School Characteristics Index to compare 4,022 schools with similar demographics at Grades 4, 7, and 10, both positive and negative statistically significant relationships were found between the presence of a school library and student achievement at Grades 4 and 7. There were no statistically significant positive relationships found at Grade 10. These findings do not support previous studies that used different methods of comparing schools with similar demographics. Also unlike previous studies, the overall effect sizes of the positive relationships were small, the average being an increase in student achievement of 2%. Factors within the school library at Grades 4 and 7 were also examined, and both positive and negative statistically significant relationships to student achievement were found.