Chaos, order and the transitions between them — these are issues which are being intensively debated in many different sciences at present. These debates are by no means restricted to the natural sciences. Numerous popularizations confirm the existence of a broad following which is intensely interested in the phenomenon. This provided the background against which the Institute Vienna Circle organized a symposion, as international as it was interdisciplinary, entitled "Order and Chaos in Nature and Society", held on 18 – 21 November 1992. The program was organized by Heinz-Otto Peitgen and Rainer Hegselmann, both at the University of Bremen.