To complete this special issue for the fiftieth anniversary of the Beveridge Plan, we felt it appropriate to reproduce an article written by the late Guy Perrin on the occasion of its fortieth. It seemed to us that his exemplary appraisal, as relevant today as it was then, amply merited republication, testifying as it does to the clearsightedness of its author. Publishing it also enables us to pay discreet homage to a colleague who will be much missed: we have no doubt, for example, that if he were still among us today he would use the Beveridge Report as a torch to illuminate for us the likely trends in social security over the next ten years. In this article, first published in 1983, Guy Perrin outlines the major principles governing the Beveridge Plan, namely those of universality, unity and what he calls integration. The many quotations and references afford an insight into the conditions under which the plan was written, enabling us to measure its impact both at the time of its publication and four decades later. It concludes by declaring that “the enduring topicality of Beveridge still exerts an impact today, in the sense that the time has come to stop following him and start imitating him”. There lies a challenge which, today more than ever, is crucial for the future of social security in the wo