IIASA is not only an institution, it is an idea -- the idea that despite differences in economic, political, and social systems, scientists from East and West can work together to help resolve the problems that face all mankind. In the six years of its existence, the Institute has demonstrated that this once "unrealistic" idea can become a reality. In the years ahead, it must strive, in collaboration with the scientific communities, governments, and industry throughout the world, to bring that idea to its fullest realization.