手法を比較

	オープンアクセスジャーナルディレクトリ	ジャーナルインパクトファクター
分野	計量書誌学	計量書誌学
系統	Process / pipeline	Process / pipeline
提唱年	2003	1955
提唱者	DOAJ Community (Swedish library consortium, later expanded to international consortium)	Eugene Garfield, Institute for Scientific Information (ISI)
種類	Database	Metric
原典	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.
別名	DOAJ, Directory of Open Access	IF, JIF, Impact Factor, 2-year Impact Factor
関連	5	5
概要	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.