Oxford is a collegiate University, consisting of the central University and colleges. The central University is composed of academic departments and research centres, administrative departments, libraries and museums. The 38 colleges are self-governing and financially independent institutions, which are related to the central University in a federal system. There are also six permanent private halls, which were founded by different Christian denominations and which still retain their Christian character. The collegiate system is at the heart of the University’s success, giving students and academics the benefits of belonging both to a large, internationally-renowned institution and to a small, interdisciplinary academic community. It brings together leading academics and students across subjects and year groups, and from different cultures and countries, helping to foster the intense interdisciplinary approach that inspires much of the outstanding research achievement of the University and makes Oxford a leader in so many fields.