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EXECUTIVE SUMMARY This paper describes the state-of-practice in project delivery methods for achieving sustainable, high performance building projects. Owners, architects, engineers, constructors, and public policy advocates are demanding that projects incorporate sustainable design and construction practices. In 2004, residential and commercial building sectors were responsible for approximately 7.9 percent of carbon dioxide emissions globally and in 2007, approximately 40 percent of energy consumption in the United States (US). Thus far in 2009, nearly 2,500 projects have received a Leadership in Energy and Environmental Design (LEED®) certification at some level, nearly 20,000 projects are registered with the US Green Building Council (USGBC), and more than 81,000 industry professionals have received the LEED Accredited Professional (AP) status from the USGBC. To date, there is no comprehensive study that explores the impacts that project delivery methods have on achieving sustainable design and construction. A project delivery method is the comprehensive process by which designers, constructors, and various consultants provide services for design and construction to deliver a complete project to the owner. The three mai