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Essential Science Indicators Connect to: Essential Science Indicators About Essential Science Indicators Essential Science Indicators (ESI) enables researchers to conduct ongoing, quantitative analyses of research performance and track trends in science. Covering a multidisciplinary selection of 8,500 journals from around the world, this in-depth analytical tool offers data for ranking authors, institutions, nations, and journals. Years of Coverage: 1991-present Access Restrictions: Restricted by IP address to Yale Univ + YNHH Off-campus Access (Proxy Server/VPN):