In 2000, the Colorado State Library published "How School Librarians Help Kids Achieve Standards: The Second Colorado Study." This follow-up study is the third Colorado study of the impact of school libraries and librarians on academic achievement, and the second study to examine their impact on student performance on the Colorado Student Assessment Program (CSAP) tests. The findings of this latest study are consistent with those of the two previous studies on several key points. Students tend to perform better on achievement tests where school libraries have more full-time equivalents (FTEs) of staffing; larger collections of periodicals and instructional videos; better-networked online resources made accessible via computers in the library as well as in classrooms, labs, and offices; higher total library expenditures; and heavier use, as indicated by both library visits and circulation. Between 2000 and 2009, similar findings have been generated by studies in 17 other states (Alaska, California, Florida, Illinois, Indiana, Iowa, Massachusetts, Michigan, Minnesota, Missouri, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Texas, and Wisconsin) as well as the Canadian province of Ontario. Many of these studies also present evidence that the relationships between library programs and test performance cannot be explained away by other school or community conditions. (Contains 8 tables and 4 charts.) [This report was produced by the Library Research Service (LRS), a unit of the Colorado State Library, Colorado Department of Education.]