This publication describes the comprehensive training program administered by the Agency for International Development (Aid) for foreign nationals in those fields most directly related to the economic, technical, and social needs of developing countries. Through the program, qualified candidates of developing countries are educated and trained in the United States and other countries where opportunities exist for relevant learning and problem solving. One of the primary objectives of U.S. development assistance is the development of human resources and the building of self-reliant and productive societies. Since the program's inception in 1941, over 170,000 participants from 135 countries have received special training in the areas of education, agriculture, industry, public health and safety, family planning, public administration, labor organization, and youth leadership. Over 99 percent of all participants in the training program returned to their home countries to work and train others in these fields. The publication contains brief descriptions of the following: (1) academic training provided through the program; (2) specialized and on-the-job training; (3) observation training; (4) emphasis on population and family planning; (5) training the trainers; (6) locating new avenues for training; and (7) complementary programs which add to the training experience. (Author/RM)