Leiden World Ranking

About Ranking of Science

The basic rule in Ranking of Science (data years 2000-2007 for Europe and 2003-2007 for the World) is comparison of entities (e.g. research groups, departments, universities) with similar entities. E.g., in teaching, first-year students have to pass first-year exams, we do not compare them with fourth-year students.

Yet, some ranking systems focusing on research tend to be unfair, as they compare entities with a different 'mix' of disciplines, or output of young researchers with the lifetime work of older and experienced scientists (as is the case for the Hirsch-Index).
The CWTS "Leiden Ranking" aims at comparison of research institutions with impact measures that take the differences in disciplines into account.

Acknowledgement

The CWTS Ranking is bases largely on our work in a project funded by the European Commission, Research DG (the "ASSIST" project).