I consider it a privilege to have been invited to write a preface for "The Limits to Certainty." It is however paradoxical that a theo retical physicist be asked to write about a monograph dealing mainly with service economics. Notwithstanding, I am delighted to do so. Indeed, it is striking that two so widely different fields like physics and social science, and more especially economics, can interact in such a constructive way. There is no question here of reductionism. Nobody claims to be able to reduce social scien ces to physics, nor to use patterns of social interaction in order to...