Six leaders of American industry and government analyze the social and economic implications of scientific and technological change. Donald Cook discusses “Technology—Mainspring of History”; Eli Goldston, “The Limits of Technology”; Joseph C. Wilson, “The New Entrepreneur”; Charles E. Thornton, “The Role of Modern Business”; E. G. Woodroofe, “Technology and Business Opportunity for the International Business”; and James E. Webb, “NASA as an Adaptive Organization.”