Leiden is one of the reputable academic assessment systems that annually evaluates and ranks the world's top universities based on a complex set of valid scientometrics indicators. In this ranking system, universities are assessed according to two categories of indicators—size-dependent and size-independent—across four main criteria: scientific impact, scientific diplomacy, open access to publications, and gender diversity.
Leiden Ranking: Indexes and Criteria
| Indexes |
Criteria |
| Scientific impact indicators |
| Total number of publications |
| Top 1% papers |
| Top 5% papers |
| Top 10% papers |
| Top 50% papers |
| TCS and MCS. The total and the average number of citations of the publications of a university |
| TNCS and MNCS. The total and the average number of citations of the publications of a university, normalized for field and publication year |
| Collaboration indicators |
| Total number of publications of a university |
| Scientific Collaboration |
| International Collaboration |
| Industrial Collaboration |
| Scientific collaboration with a geographical distance of less than 100 km |
| Scientific collaboration with a geographical distance of less than 5000 km |
| Open access indicators |
| Total number of publications of a university |
| Open access publications |
| Golden open access publications |
| Hybrid open access publications |
| Bronze open access publications |
| Green open access publications |
| The number and the proportion of a university’s publications for which the open access status is unknown. |
| Gender indicators |
| The total number of authorships of a university |
| The number of Male and Female Authors: Articles with known Authors |
| The number and Proportion of Authors with unknown Institutions |
| The number and Proportion of Male Authors |
| The number and Proportion of Female Authors |
