A new online resource, The National Performance-based Design Guide (NPBDG) has been released by the National Institute of Building Sciences. Made available through the Whole Building Design Guide, it is based on the recently updated U.S. General Services Administration P-100: Facilities Standards for the Public Buildings Service. NIBS revised the standard from a prescriptive guide to a performance-based system, making the information applicable to any public or private-sector building. Four levels of building performance—Baseline, Tier 1, Tier 2, and Tier 3—allows building owners to choose design levels and work with construction teams to meet requirements. The free guide can be accessed at npbdg.wbdg.org.