Research Guides
OU Libraries purchases some e-books through a Demand Driven Acquisitions (DDA) plan. We purchase DDA e-books from EBSCO and JSTOR. As books that match our DDA approval plan become available in e-book form, records are added to our catalog. When patrons find these books in the catalog, they click on the link and are taken seamlessly to the e-book.
The key benefit of this program is that we are not charged for books until they are actually used, thus enabling us to make more books available than if we had to purchase them all up front whether or not they are used.
EBSCO DDAs: Each title is allowed three short term loans. Short term loans are created by one of the trigger events listed below. We are charged a percentage of the book price for each short term loan and on the fourth STL we automatically purchase the e-book. All EBSCO e-books are single user e-books once fully purchased on the fourth use (EBSCO e-books purchased by other means may have different user limits).
Trigger events for EBSCO DDAs:
JSTOR DDAs: Each title is allowed six free uses. Uses are created by one of the trigger events listed below. On the seventh use we automatically purchase the e-book. All JSTOR e-books are unlimited user once perpetually purchased.
Trigger events for JSTOR DDAs: