This is the site: http://librarypublishing.scholastic.com/content/stores/LibraryStore/pages/images/slw_06.pdf
This is a research paper conducted by the US National Commission on Libraries and Information Science. Their initial study was based in Illinois.

The Illinois Study: Powerful Libraries Make Powerful Learners
Selected Research from the Most Recent Study (LANCE, RODNEY, AND HAMILTON-PENNELL, 2005)
SUMMARY: In Fall 2003, 657 Illinois schools representing all grade levels, enrollment ranges, and regions participated in a voluntary survey of their school libraries. The survey
gathered data on hours of operation, staff and their activities, the library’s collection and educational technology, total library expenditures, and several types of library usage. The evidence produced by this survey indicates that Illinois school libraries contribute measurably to the academic achievement of students, as reflected by their test scores at all grade levels. Furthermore, evidence indicates that such links between high-quality school library programs cannot be explained away by community socio-economic factors or key school conditions,
such as per pupil spending and teacher-pupil ratio. Indeed, sometimes, taking these variables into account revealed an even greater impact by school libraries and library media specialists than was previously masked by those other variables. The charts on the following pages illustrate the most significant findings from the Illinois study. They capture, indisputably, the correlation of higher test scores at all grade levels in schools:
1. where access to school libraries is flexibly scheduled
2. where school libraries are staffed more fully
3. where larger collections are available
4. where educational technology is more widely available to augment the local collection and extend access to online resources into the classroom
5. where school libraries are better funded
6. where students use school libraries, both individually and as groups, to learn and practice the information literacy skills they 7. will need to excel on tests and as lifelong learners.
3. where larger collections are available
4. where educational technology is more widely available to augment the local collection and extend access to online resources into the classroom
5. where school libraries are better funded
6. where students use school libraries, both individually and as groups, to learn and practice the information literacy skills they 7. will need to excel on tests and as lifelong learners.
And here is the data.





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