The KSUL PDA program initially adopted the direct purchase PDA model without STLs.
Using the 5-year KSUL PDA program data, based on the ebrary PDA trigger threshold for an STL and each acquired ebook's actual usage, an ebook would fit in one of the following categories: one STL (one trigger), two STLs (two triggers), three STLs (three triggers)--or purchase after three STLs (four or more triggers).
To conclude, the STL option does not make sense for KSUL. The longitudinal study illuminated the potential impact of STLs in terms of budget and collection building, and scenario analysis determined sufficient use in correlation with PDA STL charges.
We are currently conducting a study that compares PDA/ STL investment from eight large academic libraries to determine if findings from KSUL are consistent with other programs.
At KSUL, the discovery pool of PDA ebook records in the catalog is the primary gateway for the PDA model for ebooks.
KSUL catalog server transaction logs record the clicks of ebook access links in the full bibliographic records toward ebooks at the ebrary platform.
During the pilot, KSUL spent only $44,926 on purchases for triggered ebooks out of the PDA discovery pool.
However, it is important to point out that this measure is to the ebooks' disadvantage in the use time frame because they only appeared in the KSUL catalog for 6 months, while items in the print book sample were available for 1 to 2.5 years.