OCCASIONS arise when the government and private industry engage in a joint or “mixed” venture. This is especially true, today, in the area of the development and commercial exploitation of advanced technology. The supersonic transport (SST) program of the United States and of the Anglo-French Concorde is a current example. The future may reveal other areas (e.g., urban affairs, education, public health, oceanography, and the development of natural resources such as oil shale) in which a case might be made for joint ventures between government and industry. But the record of mixed ventures reveals many difficulties and problems we are not sufficiently alert to.