This document discusses the development and implementation of demand-driven acquisition (DDA) models for scholarly books at university libraries. It provides data from the University of Denver showing high percentages of unused books purchased under traditional models. The document then outlines the University of Denver's DDA plan using YBP and EBL, including record loading, user requesting workflows, and assessment considerations. It closes by discussing implications of DDA for collections, users, libraries, publishing, and book vendors.