ERL 12 – Taking guesswork out of DDA

Derek Hiatt and Carol Cramer, Wake Forest University

  • WFU: FTE just over 7,000
  • EBL: STL after 5 minutes of browsing, books can be purchased after trigger – library gets to choose what trigger point is
  • before DDA: tried to predict best trigger point based on print use stats, used stats from EBL and other libraries to get a sense of what it’d be like
  • print circ stats analysis: if a book had 16 uses, there was a 50% chance it would have at least 5 more uses, only 2% of their print books had 16+ uses
  • comparative data from EBL about other libraries: how many titles were visible, their FTE and cost per FTE – compared to WFU if their use was the same, what would it cost WFU?
  • having fewer titles visible did not actually mean they spent less money
  • did not tell users about DDA program, just that they had a bunch of new ebooks
  • what actually happened (after 11 months): 1089 books had at least one loan, 37 purchases triggered (at 6th use)
  • what does one year of usage say about the trigger point? would have spent way more money if they bought it at first and second use, but it flattens out around 7 uses
  • takeaways: 6 was a good trigger, DDA doesn’t have to break the bank (budgeted $100,000 and did not spend nearly that much), WFU doubled their DDA records as number of ebooks visible did not affect the amount spent in their research
  • firm ordering of ebooks? should we just do DDA instead?

Lea Currie, University of Kansas Libraries

  • pilot DDA project in Jan. 2010, started with print books
  • not all subject departments took part
  • worked with YBP, their book vendor
  • loaded the records that they would normally get as slips into the catalogue (3609 records), books from the expensive publishers
  • what user sees – Location: Ask KU Libraries to buy this book
  • results: saved lots of money by using demand driven rather than approval plan
  • librarian concern: catalogue not an adequate discovery tool, faculty do not want to be selectors
  • ebooks obvious next choice
  • can get ebooks fro EBL and ebrary thought YBP
  • STL, 3 times then purchase
  • new model based on price: cap on approval books ($95), more expensive books loaded into catalogue as DDA, over $150 needs to be selected by librarians (different price points but same model for different subject areas)
  • still not doing DDA for all subject areas

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