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The World Factbook is prepared by the Central Intelligence Agency for the use of US Government officials, and the style, format, coverage, and content are designed to meet their specific requirements. Information is provided by Antarctic Information Program (National Science Foundation), Bureau of the Census (Department of Commerce), Bureau of Labor Statistics (Department of Labor), Central Intelligence Agency, Council of Managers of National Antarctic Programs, Defense Intelligence Agency (Department of Defense), Department of State, Fish and Wildlife Service (Department of the Interior), National Geospatial-Intelligence Agency (Department of Defense), Naval Facilities Engineering Command (Department of Defense), Office of Insular Affairs (Department of the Interior), US Board on Geographic Names (Department of the Interior), and other public and private sources.
"The Factbook was created as an annual summary and update to the encyclopedic NIS [National Intelligence Survey] studies."
"History," CIA The World Factbook website (accessed Feb. 3, 2006)