This book presents original contributions which deal with the radical changes in today's sciences during the last twenty years. After the breathtaking unification of physical theories to the grand unification theory, new theories of evolution began to unify not only all social sciences, but also the natural with the social sciences. The book provides a fascinating analysis of these new trends which lead into the twenty-first century and a deep going critique of the received view. Sixteen papers have been assembled, two of them written by nobelists. The contributors include economists, psychologists, physicists, sociologists, utility and decision theorists, philosophers of science, and researchers in artificial intelligence. Besides giving an up-to-date and comprehensive account of the ongoing changes in today's sciences, each writer tries to make his/her contribution comprehensible to a wider audience.