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There are a number of indicators that measure the quality and impact of a particular journal. Knowing the importance of the journal can help in decisions about where an author will choose to submit an article.
A journal's Impact Factor is a measure reflecting the average number of citations to articles published in science and social science journals. It is frequently used as a measure for the relative importance of a journal within its field, with journals with higher impact factors deemed to be more important than those with lower ones.
The Eigenfactorscore is another rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. SCImago Journal and Country Rank is similar to the Eigenfactor Score, but is based on information obtained from Elsevier's Scopus database.
Some lists by subject:
ERA List is the Excellence in Research for Australia initiative. It was developed by the Australian Research Council (ARC) in conjunction with the Department of Innovation, Industry, Science and Research.