This study looks closely at the book and other resource sharing programs that academic libraries maintain with library partners, opening one another's collections to one another's library patrons.  The report gives detailed data on the types of materials shared, with separate data sets for books, journals, magazines and other periodicals, audio-visual materials, textbooks and special collections – with separate data sets for each type of material.  In addition, the report looks at library plans to expand or contract such arrangements and measures the percentage of library patron book borrowing accounted for by access through such arrangements.  The study also relates the mean and median percentage of a library's holdings subject to such arrangements and looks at issues of standardization of borrowing terms.  In open ended question, the survey participants comment on their future plans.