Demand-Driven Acquisition at HKUST Library: the New Normal Catherine S Y Kwok, Diana L. H. Chan, Ada S. M Cheung and Wong Ming Kan Hong Kong University of Science and Technology Library Structured Abstract Purpose This paper aims to evaluate the impact of three concurrent demand-driven acquisition programs on ebook collection development at HKUST Library. Design/methodology/approach COUNTER BR2 reports of the Ebrary, Wiley and JSTOR were analysed from the launch date of the respective program to June 30, 2014. Findings The value of two local demand-driven acquisition programs, Ebrary and Wiley, were seen. JSTOR program needs to be evaluated at local and consortial levels when the pilot is finished. Originality/value The experience of HKUST Library will provide a reference point for libraries who are yet to implement their DDA program. Keywords Ebooks, Demand-driven acquisitions, Patron-driven acquisitions, Collection development, Ebrary, JSTOR, Wiley, Usage, DDA, PDA Article Classification Case study Demand-Driven Acquisition Ebook collection development in Hong Kong academic libraries started in the early 2000’s. Back then, to build a critical mass of ebooks, libraries purchased huge collections of ebooks or smaller subject collections based on projected user needs and institutional research profile. This traditional “just-in-case” collection was also supplemented by subscription and pick-and- choose ebooks. In the past few years, a new wave of ebook acquisition, the demand-driven acquisition (DDA) or patron-driven acquisition (PDA) approach, has transformed the ebook landscape. Under DDA, the act of purchase no longer rests with the selector librarian, but with an unknowing user who discovers and triggers a purchase when the usage of a title exceeds a pre-determined threshold. A carefully executed DDA program will involve libraries working with publishers This is the Pre-Published Version