The basic concepts that lie behind financial and economic cost-benefit analysis are gaining acceptance in many parts of the world. Many interrelated developments have contributed to this process. The technical literature on project evaluation has been strengthened. Government leaders, pressing ahead with the ambitious programs of social and economic development, have sensed the need for making difficult choices among alternative expenditure strategies for achieving their goals. Finally, countries’ capacity to satisfy demand for better evaluation procedures has increased through courses and programs organized by universities, international agencies and national government themselves.