1. U.S. Green Building Council. (2021). LEED v4.1 Homes and Multifamily Reference Guide. Washington, DC: U.S. Green Building Council. Page 431, "IN Prerequisite: Preliminary Rating," under the "Intent" section, states: "To facilitate the integrative process and maximize the opportunities for integrated, cost-effective adoption of green design and construction strategies."
2. U.S. Green Building Council. (2008). LEED for Homes Rating System. Washington, DC: U.S. Green Building Council. Page 111, "ID Prerequisite 1: Preliminary Rating," the "Intent" section states: "To help the project team set goals and integrate the LEED for Homes process throughout the design and construction of the home." This earlier version also emphasizes the core concept of early integration.
3. Krygiel, E., & Nies, B. (2008). Green BIM: Successful Sustainable Design with Building Information Modeling. Wiley Publishing, Inc. Chapter 2, "The Integrative Design Process," discusses how early goal-setting and analysis, as mandated by prerequisites like the Preliminary Rating, are fundamental to achieving cost-effective sustainable outcomes.