The purpose of the paper is to identify and describe significant sources of foreign assistance and their interrelations, with emphasis on the US programs of assistance to less-developed nations. It is designed to provide a partial basis for further studies on coordination and effectiveness of these programs including problems associated with coordination of US economic and military assistance programs (MAPs). The paper covers programs and agencies extending capital grants and loans, investment guarantees, technical assistance, and other forms of economic assistance primarily to less-developed countries. Public sources such as governments, UN agencies, and US voluntary agencies are described. The International Monetary Fund (IMF) is also covered because of its role in stabilizing currencies that otherwise would endanger national development programs although it is not a source of economic aid in direct support of development programs. Military assistance is included only to the extent of the US program because of problems in coordinating US economic and military assistance. (Author).