The University was envisaged as being a collegiate establishment, with most students living in one of the colleges on campus, and as specialising in inter-disciplinary studies in all fields. Over the years, changes in government policy and other changing demands have largely destroyed this original concept, leading to the present state, which is nearer the norm for a British university. However, the four original colleges – Darwin, Eliot, Keynes and Rutherford – remain, together with the newer Woolf and Turing colleges, each with their own masters.