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Scope and Coverage

Item Selection

Papers are defined as regular scientific articles and review articles. Letters to the editor, corrections, abstracts, and retracted articles are excluded.

Journal Coverage

Article counts for Essential Science Indicators are derived from 11,728 journals indexed in Web of Science Core Collection (Science Citation Index Expanded and Social Sciences Citation Index only) over a 10-year period. Citation counts for these articles are derived from journals indexed in Web of Science Core Collection (Science Citation Index Expanded, Social Sciences Citation Index and Arts & Humanities Citation Index)

Each journal is assigned to one of 22 research fields. In ESI, a journal can be assigned to only one field.  Journals such as Science and Nature are categorized as multidisciplinary since they publish research in many different fields. As a result, papers published in these multidisciplinary journals are assigned to a field based on the representation of the cited journals. For example, if the majority of cited references in the paper are to neuroscience journals, the paper is then categorized as neuroscience. 

Journal List

The master journal list (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 782.4 kB, info), which comprises all active journal titles eligible for inclusion in Essential Science Indicators, has been updated as of November 15, 2018, to cover a 10-year plus 8-month period, January 1, 2008 – August 31, 2018. Data is updated bi-monthly (six times a year). This is the fourth bi-monthly period of 2018.

This master journal list will be updated regularly. The current extraction date is October 1, 2018.