“…Citation analysis-i.e., the analysis of data derived from references cited in footnotes or bibliographies of scholarly publications-is a powerful and popular method of examining and mapping the intellectual impact of scientists, projects, journals, disciplines, and nations (Borgman, 1990;Garfield, value and necessity of using multiple citation sources for examining and mapping the intellectual impact of research; and (3) the appropriateness of using Scopus as an alternative source of citations to Web of Science. These three issues are raised primarily because of the considerably broader literature coverage in Scopus (over 15,000 "peer-reviewed" titles, including more than 1,000 Open Access journals, 500 conference proceedings, and 600 trade publications going back to 1996) than that of Web of Science (approximately 9,000 scholarly journals and a significant number of conference proceedings and books in series); users of citations for research evaluation want to know what are the effects of this broader coverage on evaluation results, how significant are the effects of this broader coverage, and what characterizes the sources exclusively covered by Scopus (in terms of impact, quality, and type of documents).…”