Compara mètodes

	Emerging Sources Citation Index	Journal Citation Reports	Ulrichsweb Directori Global de Publicacions Seriades
Camp	Bibliometria	Bibliometria	Bibliometria
Família	Process / pipeline	Process / pipeline	Process / pipeline
Any d'origen	2015	1975	1932
Autor original	Clarivate Analytics	Institute for Scientific Information (ISI), now Clarivate Analytics	Bowker (originally R.R. Bowker), now ProQuest LLC
Tipus	Database	Tool	Database
Font seminal	Clarivate Analytics. (2024). Emerging Sources Citation Index. Retrieved from https://clarivate.com/webofsciencegroup/solutions/web-of-science-core-collection/	Clarivate Analytics. (2024). Journal Citation Reports. Retrieved from https://clarivate.com/webofsciencegroup/solutions/journal-citation-reports/	ProQuest. (2024). Ulrichsweb: Global Serials Directory. Retrieved from https://ulrichsweb.serialssolutions.com/
Àlies	ESCI, Web of Science Emerging Sources Citation Index	JCR, Clarivate Journal Citation Reports	Ulrichsweb, Ulrich's International Periodicals Directory, Ulrich's Directory
Relacionats	5	5	4
Resum	The Emerging Sources Citation Index (ESCI) is a supplement to Web of Science Core Collection launched by Clarivate Analytics in 2015 to expand journal coverage beyond the traditional Science Citation Index Expanded (SCI-E), Social Sciences Citation Index (SSCI), and Arts & Humanities Citation Index (A&HCI). ESCI includes high-quality, peer-reviewed journals that are newer, from underrepresented geographic regions, or from emerging disciplines not yet established in traditional indexes. Unlike SCI-E/SSCI journals, ESCI journals do not initially receive Impact Factor calculations. However, ESCI serves as a pathway: journals demonstrating sustained citation impact and adherence to quality standards may be promoted to SCI-E/SSCI and gain Impact Factor recognition. ESCI addresses systematic geographic and disciplinary biases in traditional indexing by including quality journals from developing economies, Eastern Europe, Latin America, and Asia.	Journal Citation Reports (JCR) is an annual publication by Clarivate Analytics providing comprehensive citation metrics and performance analytics for journals indexed in Web of Science Core Collection. Launched in 1975, JCR publishes Impact Factor, the most widely recognized journal quality metric, alongside supplementary metrics (5-year IF, Journal Citation Indicator, Immediacy Index, Cited Half-Life, and citation distribution analysis). JCR is the authoritative source for journal ranking, benchmarking, and impact assessment in research evaluation systems globally. Access requires institutional subscription, though some institutions provide free access to affiliated researchers.	Ulrichsweb is a comprehensive, subscription-based global serials directory cataloging over 300,000 print and electronic journals, magazines, newspapers, and other periodical publications. Developed by ProQuest (originally R.R. Bowker), Ulrichsweb has served librarians and researchers for over 90 years as the authoritative source for journal metadata, publication information, and peer-review verification. A unique feature is Ulrichsweb's verification program: editorial staff contact journals directly to confirm peer-review claims, marking journals as 'refereed' only after validation. This verification process distinguishes legitimate peer-reviewed journals from predatory publishers falsely claiming peer review.