Add to ORKGLeibniz’s role en current political and social thought is complex. On the one hand, he represents the last great synthesis built on the idea of the World as a creation of God and man as his cooperator in history. However his notion of contingency can help to explain some of the problems facing social sciences today in so far as he understandsthis concept not only from an ontological but also from an epistemological point of view. To this one should add that criticisms of classical and modern philosophy such as those of Isaiah Berlin and Hannah Arendt leave intact the need of reason to organise society and we can see in Leibniz use of reason a forerunner of public choice postions. In sum, his vision of reason is very much alive though in new...