This website provides, in full, a chapter excerpted from the book entitled “”Ecosystem Management: Applications for Sustainable Forest and Wildlife Resources”” edited by M.S. Boyce and A. Haney, 1997. The hierarchical framework is a regionalization classification and mapping system for stratifying the Earth into progressively smaller areas of increasingly uniform ecological potentials. Ecological types are classified and ecological units are mapped based on associations of those biotic and environmental factors. Ecoregion and subregion levels of the hierarchy are developed by stratification as fine scale field classifications and inventories. The chapter stresses the connections between mapping ecological units and ecosystem management opportunities. A list of cited references appears at the end of the chapter.