Scope and Coverage

Journal Coverage

Article counts for Essential Science Indicators are derived from 12,200 journals indexed in Web of Science Core Collection (Science Citation Index Expanded and Social Sciences Citation Index only) over an 10-year and four-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.

Journal List

The ESI journal list, which comprises all active journal titles eligible for inclusion in Essential Science Indicators, has been updated as of July 9, 2020 to cover a 10-year and four-month period, January 1, 2010 – April 30, 2020. Data is updated bi-monthly (six times a year). This is the second bi-monthly period of 2020.

This ESI journal list will be updated regularly. The current extraction date is June 1, 2020.

Item Selection

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

File Depth

The years shown in ESI reports are publication years, unless otherwise indicated. ESI indicators are calculated from 10 years and four 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.

Database Year Coverage
2010 Full year
2011 Full year
2012 Full year
2013 Full year
2014 Full year
2015 Full year
2016 Full year
2017 Full year
2018 Full year
2019 Full year

2020

Four Months