The QS World University Rankings by Subject rankings aim to help prospective students identify the world’s leading schools in their chosen field. Each of the subject rankings is compiled using four sources. The first two of these are QS’s global surveys of academics and employers, which are used to assess institutions’ international reputation in each subject. The second two indicators assess research impact, based on research citations per paper and h-index (a way of measuring both the productivity and impact of the published work) in the relevant subject.
These four components are combined to produce the results for each of the subject rankings, with weightings adapted for each discipline. In 2018, the QS World University Rankings by Subject were based on responses from more than 40,000 academics worldwide.