Impact factor, or Journal Impact Factor, is a measure of the frequency with which the "average article" published in a given scholarly journal has been cited in a particular year or period and is often used to measure or describe the importance of a particular journal to its field. Impact factor was originally developed by Eugene Garfield, the founder of Institute of Scientific Information, which is now a part of Clarivate Analytics. Journal Impact Factor can be found in the Journal Citation Reports or the JCR, as it's commonly known. Over the years various organizations have been created similar journal-level metrics, such as SCImago Journal & Country Rank.
This page describes how to find impact factor in Journal Citation Reports.
Clarivate Analytics (formerly Institute for Scientific Information (ISI)) ranks, evaluates, and compares journals within subject categories and publishes the results in Journal Citation Reports. Journal Citation Reports provides ranking for journals in science, technology, and the social sciences. For every journal, the database collects and/or calculates information such as:
Follow the instructions below to find the Journal Citation Reports using the Library's resources.
Once you find a journal, the JCR gives you information about the journal, including the journal's abbreviations, how often it is published each year, the publisher, and the ISSN. The Journal Citation Report also provides the impact factor both for the last two and five-year periods. You may notice that JCR provides Eigenfactor scores as well.
Many people have questioned the legitimacy of impact factor. Here are a few reasons why: