“…Experimentations with DDA models revealed that a comprehensive assessment of such programs should use of a variety of metrics in order to gain a more granular understanding of program performance and the level of satisfaction of all stakeholders [10,11]. Many DDA assessment studies have since concluded that the model fulfills librarian expectations and user needs [12], has a better cost per use than other traditional ebooks packages [13,14], is advantageous for specific disciplines [13], and provides collection development benefits for academic libraries overall [15,16]. Some studies assert, nevertheless, that there is still yet insufficient data to demonstrate conclusively the benefits of DDA over traditional collection development practices [17,18].…”