This document discusses the future of collaborative collection development in libraries. It notes that libraries now face challenges like ubiquitous information, user disintermediation, declining use of physical collections, and the rise of digital technologies. It explores collaborative approaches taken by projects like WEST for journal storage and HathiTrust for digital books. While collaborative print book collection will be more difficult than journals, there are still opportunities for initiatives like shared e-book licensing, approval plans, storage facilities, and bibliographers. The future of collection may involve newer areas like web archiving, data publication, and earlier engagement in the research lifecycle.