JCR provides a means of determining the relative importance of scholarly and technical journals within their subject disciplines by using a variety of citation and article counts attributed to each journal. Journals are evaluated and ranked according to their impact factor (how often the journal is cited), immediacy index (how quickly an article is cited), and other criteria. This results in one method for identifying a subject's core journals. There are two editions available. The Science Edition contains data from roughly 5,000 journals in the areas of science and technology. The Social Sciences Edition contains data from roughly 1,500 journals in the social sciences. There is no citation report for the arts and humanities. (Updated annually)
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