This paper is missing from PAPERS BY OTHERS file cabinet "This study was initiated by the Science and Technology Policy Office (STPO) of NSF in support of the Director of NSF in his role as Presidential Science Advisor (a function now carried out by the Office of Science and Technology Policy (OSTP) in the Executive Ofiice of the President). It was a first experiment in applying systematic approaches to anticipate and assess future critical problems. The outcome..."