Σύγκριση μεθόδων

	Κατάλογος περιοδικών ανοικτής πρόσβασης	Συντελεστής Επίδρασης Περιοδικού	Κατάλογος Σειριακών Εκδόσεων Ulrichsweb Global Serials Directory
Πεδίο	Βιβλιομετρία	Βιβλιομετρία	Βιβλιομετρία
Οικογένεια	Process / pipeline	Process / pipeline	Process / pipeline
Έτος προέλευσης	2003	1955	1932
Δημιουργός	DOAJ Community (Swedish library consortium, later expanded to international consortium)	Eugene Garfield, Institute for Scientific Information (ISI)	Bowker (originally R.R. Bowker), now ProQuest LLC
Τύπος	Database	Metric	Database
Θεμελιώδης πηγή	Directory of Open Access Journals. (2024). About DOAJ. Retrieved from https://doaj.org/	Garfield, E. (1972). Citation analysis as a tool in journal evaluation. Science, 178(4060), 471-479.	ProQuest. (2024). Ulrichsweb: Global Serials Directory. Retrieved from https://ulrichsweb.serialssolutions.com/
Εναλλακτικές ονομασίες	DOAJ, Directory of Open Access	IF, JIF, Impact Factor, 2-year Impact Factor	Ulrichsweb, Ulrich's International Periodicals Directory, Ulrich's Directory
Συναφείς	5	5	4
Σύνοψη	The Directory of Open Access Journals (DOAJ) is a community-maintained, freely accessible directory of high-quality, peer-reviewed open-access journals and articles established in 2003. DOAJ indexes over 20,000 open-access journals across all disciplines (sciences, social sciences, humanities, arts) from diverse geographic regions. The directory serves researchers, librarians, and administrators as the authoritative curated list of legitimate open-access journals—differentiating quality open-access publications from predatory journals that lack genuine peer review. DOAJ quality seal, awarded to journals meeting stricter governance and transparency criteria, enables identification of the highest-caliber open-access publications.	Journal Impact Factor (JIF) is a metric developed by Eugene Garfield in 1955 and published annually by Clarivate Analytics through Journal Citation Reports (JCR). It measures the average citation frequency of articles published in a journal over a two-year window, serving as a proxy for journal prestige and influence. A journal's Impact Factor equals the number of citations received in year Y to articles published in Y-1 and Y-2, divided by the number of citable items published in that same window. Despite widespread adoption in research evaluation, Impact Factor has significant limitations and critics argue it conflates journal prestige with article quality.	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.