The U.S. Department of Transportation, in cooperation with EPA, the U.S. Department of Energy, HUD, and the Joint Center for Sustainable Communities, should establish a comprehensive program to develop new and improved analytical tools for land use, transportation, and environmental planning. States and localities need useful tools for analyzing and modernizing their planning laws and techniques, and for guiding public and private development in a sustainable manner. This effort should recognize ongoing work by professional associations that have developed planning tools on smart growth with the support of federal funding, such as the American Planning Association's Growing Smart Legislative Guidebook and Clearinghouse.