This document discusses patron-driven acquisition (PDA) models for ebook collections. It provides context on PDA by defining the concept and noting its importance in addressing patron demands within budget constraints. The document then examines how PDA can work in practice, including discovery options, pre-selection, mediation of purchase requests, funding, and access to purchased materials. It also presents a case study of PDA implementation at Norwich University and examines usage data and student preferences related to ebooks. The document argues that PDA aligns with the purpose of meeting patron needs and should be further explored despite challenges.