Collection librarians in the humanities, social sciences, and sciences have had different opportunities for building ebook collections and, as a result, their collections have developed very differently. Ebooks have been more quickly embraced by the sciences, with science publishers offering an array of ebook choices, while the social sciences and humanities have progressed more slowly and with fewer options. In addition, librarians in the humanities have witnessed image copyright issues which can leave ebooks without any illustrations at all. These disciplinary inequalities mean that interdisciplinary scholars often face very different ebook options within the same library. Librarian selectors may intuit that users “don’t want” ebooks, but they may also be giving them few choices. One positive outcome from this “chicken and egg” scenario (users can’t choose ebooks if they aren’t there, and ebooks aren’t there because they don’t choose them) are DDA programs that offer multidisciplinary ebooks to users with a manageable price. The UIUC Library’s ebook DDA pilot was initiated to determine the interest in and use of ebooks by non-traditional users, specifically humanists. In addition to the DDA, a survey was conducted to tease more information from humanities ebook users; the success of the survey and the DDA pilot ( presented at the 2013 Charleston Conference) encouraged researchers to extend the study to the social sciences, and ultimately to scientists. These three separate surveys offer a comparative look at how the three disciplines vary in their perceptions concerning the value and usability of ebooks in their fields. These studies, partially supported by a grant from the Institute of Museum and Library Services (via “LibValue,”) specifically examine how a spectrum of scholars adopts ebooks and how they envision a migration to the ebook format. Attendees will gain insight on the ebook perceptions of scholars from each of the three major disciplines.