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This paper describes how Utrecht University Library is trying to reach a sustainable and efficient PDA model, offering more e-books to our users. PDA e-books were made available in the catalog. We developed an efficient back office process for updates, deletions and financial administration. We did pilot programs to test PDA as an acquisition model. During the pilot anonymized user data was collected of patrons and their use of PDA e-books. Due to heavy usage and too fast depletion of budget we had to adjust our PDA model. The collected data helped to understand the development of costs and to decide about the changes in the PDA model. After a year PDA pilot, we developed a predictable PDA model. However, for a sustainable model there are still challenges, not only due to dilemmas on restricting the PDA profile, but also due to publishers raising STL prices.

Patron-Driven Acquisition: What Do We Know about Our Patrons?