Economics and Usage of Digital Libraries: Byting the BulletSkip other details (including permanent urls, DOI, citation information)
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The IEEE's IEL product offers IEE and IEEE journals and conference proceedings in Adobe Acrobat format. These are received monthly and loaded onto the library server, so that data on usage are available for study. In the BT implementation, user registration is not necessary to access these publications, so user analysis is limited to studying access by IP address. Data on usage are available from November 1998, which is too short a period to do more than speculate on seasonal variations beyond noticing the obvious drop in readership at the Christmas/New Year period.
A mean of 39 users read IEL papers each week, with a minimum of 7 and a maximum of 56. These users read 11 papers each, with a minimum of 4 and a maximum of 38.
The IEL collection offers a typical usage pattern, with 80% of journal usage concentrated on 21% of the titles in the package.