The Core Performance Guide outlines a step-by-step simplified approach to achieve predictable energy savings in small- to medium-sized buildings without the need for modeling. The Guide is the new version of Benchmark 1.1, a nationally recognized resource on how to deliver best-in-class energy efficiency and indoor environmental quality in high performance commercial buildings. The Core Performance program brings together over 30 criteria defining high performance in building envelope, lighting, HVAC, power systems and controls. With its well-organized and easy-to-use guide, building design and construction professionals will gain access to quantitative and descriptive specifications for exceeding state and national energy standards such as ASHRAE 90.1-2004 by 20 to 30 percent.