The Times Higher Education magazine recently released its annual World University Rankings. This year, California Institute of Technology (Caltech) tops the list, followed by Harvard University and University of Oxford in the U.K. This is the fourth year in a row that Caltech has been named the world’s best institution.

As one of the three most influential international university rankings, the Times Higher Education rankings list the best universities under six categories: overall rankings (World University Rankings), rankings by majors, reputation rankings, Asian university rankings, BRICS & emerging economies rankings, and 100 under 50. “100 under 50” is a ranking of the top 100 universities under 50 years old.

Two rankings are now available for 2014-2015: the World University Rankings and global university rankings by majors.

U.S. universities continue to lead the World University Rankings, taking seven of the top ten positions. Three British universities (University of Oxford, University of Cambridge and Imperial College London) are among the top 10.

The University of Tokyo, which ranks No. 23 on the list, is the highest ranked Asian university. This year also marks the fourth year that the University of Tokyo ranks the highest among all Asian universities. National University of Singapore ranks 25 on the list, claiming to be the second highest ranked Asian university. In addition, nineteen Asian universities are among the top 200, with three from Mainland China (Peking University-48, Tsinghua University-49, and Fudan University-193), and more from Hong Kong, Japan, Republic of Korea and Singapore.

Among the top 100 list, 45 are from the U.S., 11 from the U.K., six from the Netherlands and Germany, respectively. The rest are from 13 other countries all over the world, including 11 from Asian countries.

Five categories of factors are taken into consideration to generate the rankings: teaching (30%), research (30%), citations (30%), industry income (2.5%), and international outlook (7.5%).

According to the official announcement, “universities are excluded from the rankings if they do not teach undergraduates; if they teach only a single narrow subject; or if their research output amounted to fewer than 1,000 articles between 2008 and 2012 (200 a year).”

For a full list of rankings, please visit http://www.timeshighereducation.co.uk/world-university-rankings.