The document summarizes the Library Impact Data Project, which investigated the relationship between student library usage and academic performance. The project was led by the University of Huddersfield and involved several other universities. It found correlations between increased usage of library resources like books, e-journals and databases and better student grades. A second phase of the project performed a more in-depth analysis of usage metrics and confirmed a link to student outcomes. The results were shared online to help libraries demonstrate their value through data.