Institute for Scientific Information
The Institute for Scientific Information (ISI ), founded in 1960 by Eugene Garfield, maintains reference indexes and creates bibliometric analysis.
For the Science Citation Index, the Arts and Humanities Citation Index and the Social Sciences Citation Index footnotes and bibliographies are evaluated from about 8000 scientific journals. So is documented, by whom and how often a scientific publication is referenced. The magazines were partially evaluated back to 1945. For the indexed journals, ISI determines a Impact Factor, which is to quantify their influence in the respective fields and will be published annually in the Journal Citation Reports.
In 1992, the Thomson Corporation acquired the Institute for Scientific Information, running it as Thomson Scientific on.