View source for Patron-driven acquisition

'''Patron-driven acquisition''' (PDA), also referred to as '''demand-driven acquisition''' (DDA),<ref name=DDA>{{cite web|last=Esposito|first=Joseph|title=Revisiting Demand-driven Acquisitions|date=15 October 2014|url=http://scholarlykitchen.sspnet.org/2014/10/15/revisiting-demand-driven-acquisitions/|publisher=The Scholarly Kitchen}}</ref> is a model of library collection development in which a library only purchases materials when it is clear that a patron wants them.  In an ideal transaction, libraries provide the patron with access to [[Search engine|search engine]]s, academic databases and/or [[Library catalog|library catalog]]s from which the patron can request items. When certain thresholds are reached for an item (e.g., number of pages read or number of requests), the library purchases the item and delivers instant access to patrons.<ref name=PDA>{{cite web|last=Anderson|first=Rick|title=What Patron-Driven Acquisition (PDA) Does and Doesn't Mean: An FAQ|date=31 May 2011|url=http://scholarlykitchen.sspnet.org/2011/05/31/what-patron-driven-acquisition-pda-does-and-doesnt-mean-an-faq/|publisher=The Scholarly Kitchen}}</ref> The library may acquire the resource permanently, or acquire a license to use the resource only at certain times or in certain ways. Since content purchased is in digital format, "PDA emphasizes collecting for and at the moment of need" instead of collecting with a long-term focus.<ref name="PDAhnp">{{cite book |last=Swords|first=David|title=Patron-Driven Acquisitions: History and Best Practices |date=2011|location=Berlin|publisher=Walter de Gruyter|isbn=9783110253030}}</ref>
PDA is frequently associated with [[E-book|e-book]] collections, although print and hybrid PDA options also exist.<ref>{{cite web |last1=Esposito|first1=Joseph J|last2=Walker|first2=Kizer|last3=Ehling|first3=Terry|title=PDA and the University Press|date=16 October 2012|url=http://jhir.library.jhu.edu/handle/1774.2/36210|accessdate=5 January 2017|pages=39–43}}</ref> There are several benefits to focusing this practice on the use of digital content: delivery is instantaneous; e-books require no physical space, which requires specific costs to maintain; libraries can afford patron access when they might not be able to afford to buy materials, increasing the collection's ability; and purchases are guaranteed usage, which is an important consideration when purchasing materials.<ref name="PDAhnp" />

==Interfaces==

Libraries typically index ebooks that are available for purchase in their catalogs or discovery layers.  Libraries may limit their indexing to items with certain pricing, available licensing options, topics, publishers, and/or to items that the library does not already make available in a different format.<ref name="Fischer" />

Some libraries choose a PDA interface in which patrons are unaware that they are causing an ebook to be purchased, to avoid purchases that are not immediately needed and to encourage patrons who would not otherwise initiate a purchase.  The University of Iowa reported that this type of system, when unmediated by library collection development staff, can lead to a very high level of purchases.<ref name="Fischer">{{cite journal|last1=Fischer|first1=K. S.|last2=Wright|first2=M.|last3=Clatanoff|first3=K.|last4=Barton|first4=H.|last5=Shreeves|first5=E.|title=Give 'Em What They Want: A One-Year Study of Unmediated Patron-Driven Acquisition of e-Books|journal=College & Research Libraries|date=22 September 2011|volume=73|issue=5|pages=469–492|doi=10.5860/crl-297|url=https://works.bepress.com/karen_s_fischer/11/download/|doi-access=free}}</ref>

==References==
{{Reflist}}


[[Category:Information science]]

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