Science Citation Index

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The Science Citation Index ( SCI ) is a scientific citation database founded by the Institute for Scientific Information (ISI), later offered by the US-Canadian media company Thomson Reuters Corporation and currently operated by Clarivate Analytics .


Development of this product was made possible by a grant from the National Institute of Health in 1961. As part of his sponsored work, Eugene Garfield developed a comprehensive interdisciplinary index of citations . The Science Citation Index for 1961 was extracted from this index in 1963, comprising 562 journals and 2 million citations.

Appropriate for the time, the work was published in printed form, but as early as 1966 the data was published on magnetic tapes for the first time .

Today there are both printed editions of the Science Citation Index and a DVD-ROM edition. The Science Citation Index includes over 3750 journals.

Science Citation Index Expanded

Although the Science Citation Index is a common name for many users, it is often confused with the larger online version "Science Citation Index Expanded" (SCIE).

The SCIE is characterized by a more comprehensive coverage of the international research literature. It covers over 8,800 scientific journals in over 150 disciplines. The database is available on the Internet as part of the Web of Science with data from 1945 onwards. The data is also available as a Scisearch via Dialog with data from 1980. Data from 1900 onwards are available through the Century of Science .

The Science Citation Index Expanded is also the basis for the Impact Factor published annually as part of the Journal Citation Report .

The Science Citation Index and the Science Citation Index Expanded serve many scientists as the basis for bibliometric analyzes.

Journal Citation Report

The report subdivides the various areas of the respective research area.

Web links

Individual evidence

  1. (accessed May 31, 2013).
  2. (accessed May 31, 2013).