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    This paper was first presented at the Pricing Electronic Access to Knowledge (PEAK) conference entitle "Economics and Usage of Digital Library Collections," held at the University of Michigan in Ann Arbor, Michigan on March 23 24, 2000.return to text

    1. Participating JSTOR libraries and publishers have requested that JSTOR exercise care when presenting and distributing JSTOR usage data. We therefore aggregate these data whenever possible and do not identify the usage at individual sites, for individual publishers, or for individual articles by title.

    2. The original test site libraries were Bryn Mawr College, Swarthmore College, Haverford College, Denison University, and Williams College, in addition to the University of Michigan.

    3. JSTOR digitizes and makes accessible participating journals starting with the first volume published.In order to protect publishers' subscription revenue stream, JSTOR does not include current issues, but offers access up to a "moving wall" negotiated with each publisher.

    4. In assembling usage statistics, JSTOR counts significant accesses, not server hits. Accesses include actions such as viewing electronic tables of contents or citation data, viewing an article, printing an article and executing a search.

    5. JSTOR uses the Carnegie Classes of U.S. Institutions of Higher Education to place colleges and universities into one of five classes ranging from Very Large to Very Small. For a description of our methodology, see http://www.jstor.org/about/us.html#classification .

    6. JSTOR's initial database offering, called Arts & Sciences I, includes journals from 15 academic disciplines, and are displayed in the interface in these groups, which are sometimes referred to as clusters.

    7. Citation data were determined using the Dialog service to access ISI Social Science Citations. Individual articles were located, and citations to these articles were analyzed by year of publication. Data were determined for 1997-1999 inclusive by simple addition. Average number of cites per year was figured beginning in the year of publication or 1972, whichever is later, through the end of 1999, then dividing that total number by the number of years since publication or 1972, whichever is later. 1972 is the earliest year of data provided by ISI in the version of the database we consulted.