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A gateway to government science information and research results from over 60 databases, over 2,200 websites, and over 200 million pages. Free United States Government: Science Citation Index [67] Multidisciplinary: Part of Web of Science. 24,000+ journals across 254 subject disciplines. Subscription Clarivate Analytics
The Science Citation Index Expanded (previously titled Science Citation Index) is a citation index originally produced by the Institute for Scientific Information (ISI) and created by Eugene Garfield. The Science Citation Index (SCI) was officially launched in 1964, [1] and later was distributed via CD/DVD. [2]
The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science.
ISI maintained citation databases covering thousands of academic journals, including a continuation of its longtime print-based indexing service the Science Citation Index (SCI), as well as the Social Sciences Citation Index (SSCI) and the Arts and Humanities Citation Index (AHCI).
The university stated that "it has become a very sick model that goes beyond what is really relevant for science and putting science forward". [90] [91] This followed a 2018 decision by the main Dutch funding body for research, NWO, to remove all references to journal impact factors and the h-index in all call texts and application forms. [92]
Web of Science employs various search and analysis capabilities. First, citation indexing is employed, which is enhanced by the capability to search for results across disciplines. The influence, impact, history, and methodology of an idea can be followed from its first instance, notice, or referral to the present day.
In 1961 Garfield received a grant from the U.S. National Institutes of Health to compile a citation index for Genetics. To do so, Garfield's team gathered 1.4 million citations from 613 journals. [8] From this work, Garfield and the ISI produced the first version of the Science Citation Index, published as a book in 1963. [10]
It is a size-independent indicator and its values order journals by their "average prestige per article" and can be used for journal comparisons in science evaluation processes. The SJR indicator is a free journal metric inspired by, and using an algorithm similar to, PageRank .