best university worldwide and first in Britain for forming CEOs according to the Professional Ranking World Universities, and first in the UK for the quality of its graduates as chosen by the recruiters of the UK's major companies. In the 2018 Complete University Guide, all 38 subjects offered by Oxford rank within the top 10 nationally meaning Oxford was one of only two multi-faculty universities (along with Cambridge) in the UK to have 100% of their subjects in the top 10. Computer Science, Medicine, Philosophy, Politics and Psychology were ranked first in the UK by the guide. According to the QS World University Rankings by Subject, the University of Oxford also ranks as number one in the world for four Humanities disciplines: English Language and Literature, Modern Languages, Geography, and History. It also ranks second globally for Anthropology, Archaeology, Law, Medicine, Politics & International Studies, and Psychology. Student life Traditions Academic dress is required for examinations, matriculation, disciplinary hearings, and when visiting university officers. A referendum held among the Oxford student body in 2015 showed 76% against making it voluntary in examinations – 8,671 students voted, with the 40.2% turnout the highest ever for a UK student union referendum. This was widely interpreted by students as being a vote not so much on making subfusc voluntary, but rather, in effect, on abolishing it by default, in that if a minority of people came to exams without subfusc, the rest would soon follow. In July 2012 the regulations regarding academic dress were modified to be more inclusive to transgender people. Other traditions and customs vary by college. For example, some colleges have formal hall six times a week, but in others this only happens occasionally, or even not at all. At most colleges these formal meals require gowns to be worn, and a Latin grace is said. Balls are major events held by colleges; the largest, held triennially in ninth week of Trinity Term, are called commemoration balls; the dress code is usually white tie. Many other colleges hold smaller events during the year that they call summer balls or parties. These are usually held on an annual or irregular basis, and are usually black tie. Punting is a common summer leisure activity. There are several more or less quirky traditions peculiar to individual colleges, for example the All Souls Mallard song. Clubs and societies Sport is played between college teams,