Objective – At the University of California, Berkeley (UCB), researchers compared how well the library collections supported doctoral research in the three related disciplines of education, psychology, and social welfare. The goal of this project was to gather empirical data to answer questions about materials cited in dissertations, including ownership, age of materials and disciplinary usage. Conclusions – The citation analysis, while time-consuming, provided new and important information about the use of the Library’s collections and the level of support the collections afford doctoral students in the three related disciplines of education, psychology and social welfare. This data has informed collections-related decisions including format purchases and fund allocations.