“…Bollen and Van de Sompel (2008), in an ambitious study, gathered OpenURL clickthrough data from the entire California State University system for a period of about a year and nine months and used the data in the creation of a usage-based journal impact factor. Studies of user behavior with regard to ILL services have employed a variety of types of data over the years, including locally compiled ILL request data (Chmelir, 2005;Foote and Person, 1995;Page and Kuehn, 2009;Williams and Bailey, 2007;Williams and Woolwine, 2011), survey instruments (Frank and Bothmann, 2007;Porat and Fine, 2009), locally tabulated circulation data (Munson, 2006a), data from user account settings in ILLiad (Herrera, 2003), and OCLC resource sharing statistics (Leykam, 2008). Some studies have begun to incorporate the OpenURL resolver as a dimension in the study of user behavior with ILL. Frank and Bothmann (2007), in a study of undergraduate use of ILL, found that use increased with the implementation of an OpenURL resolver and that three out of four ILL requests by undergraduates began from the link resolver.…”