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How much does an interlibrary loan request cost? A review of the literature

Interlibrary loan (ILL) services are used to fill the gap between academic libraries' collections and the information needs of their users. Today's trend toward the cancellation of serials "Big Deals" has increased the importance of clear information around ILL to support decision-making. In order to plan the cancellation of a journal package, academic libraries need to be able to forecast their total spendings on ILL, which requires to have an appropriate estimate of what it costs to fulfill an individual ILL request. This paper aims to help librarians answer this question by reviewing the most recent academic literature related to these costs. There are several factors that may affect the cost of an ILL service, including the cost of labour, the geographic location of the library, the use of a ILL software, and membership to a library consortium. We find that there is a wide range of estimates for ILL cost, from $3.75 (USD) to $100.00 (USD). However, Jackson's (2004) figure of $17.50 (USD) per transaction remains the guideline for most researchers and librarians.