Scope and Coverage
Article counts for Essential Science Indicators are derived from 12,207 journals indexed in Web of Science Core Collection (Science Citation Index Expanded and Social Sciences Citation Index only) over an 10-year and six-month 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.
The ESI journal list, which comprises all active journal titles eligible for inclusion in Essential Science Indicators, has been updated as of September 2020 to cover a 10-year and six-month period, January 1, 2010 – June 30, 2020. Data is updated bi-monthly (six times a year). This is the third bi-monthly period of 2020.
This ESI journal list will be updated regularly. The current extraction date is August 1, 2020.
Papers are defined as regular scientific articles and review articles. Letters to the editor, corrections, abstracts, and retracted articles are excluded.
The years shown in ESI reports are publication years, unless otherwise indicated. ESI indicators are calculated from 10 years and six months of data. ESI is updated six times a year. The most recent update may add documents published in the previous year, in which case metrics based on the previous publication year may be adjusted.