This Technical Support Document describes the process and methodology for the development of the Advanced Energy Design Guide (AEDG) for Small Office Buildings, a design guidance document intended to provide recommendations for achieving 30% energy savings in small office buildings over levels contained in ASHRAE Standard 90.1- 1999. This the first in a series of guides being developed by a partnership of organizations, including ASHRAE, the American Institute of Architects, the Illuminating Engineering Society of North America, the New Buildings Institute, and the U.S. Department of Energy.