In 2011, school libraries throughout Pennsylvania responded to a survey commissioned by the state legislature. The survey asked questions about school library staffing, staff activities, collections, technology, hours and access, visits, expenditures, and more. Consistently with previous school library impact studies, this analysis found that test scores tend to be significantly higher for schools that have full-time certified school librarians as well as for those that have such a librarian with support staff. The second phase of this study is based on qualitative surveys of administrators, teachers, and librarians.
Lance, K. (2012). Assessing the Infrastructure Needs of 21st Century School Library Program. Harrisburg: Pennsylvania Department of Education.