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The Leiden Ranking 2011/2012 is a ranking of universities based onbibliometric indicators of publication output, citation impact, and scientificcollaboration. The ranking includes 500 major universities from 41 differentcountries. This paper provides an extensive discussion of the Leiden Ranking2011/2012. The ranking is compared with other global university rankings, inparticular the Academic Ranking of World Universities (commonly known as theShanghai Ranking) and the Times Higher Education World University Rankings.Also, a detailed description is offered of the data collection methodology ofthe Leiden Ranking 2011/2012 and of the indicators used in the ranking. Variousinnovations in the Leiden Ranking 2011/2012 are presented. These innovationsinclude (1) an indicator based on counting a university's highly citedpublications, (2) indicators based on fractional rather than full counting ofcollaborative publications, (3) the possibility of excluding non-Englishlanguage publications, and (4) the use of stability intervals. Finally, somecomments are made on the interpretation of the ranking, and a number oflimitations of the ranking are pointed out.

The Leiden Ranking 2011/2012: Data collection, indicators, and interpretation