This document discusses the need for Interagency Environmental Guidelines (IEG) similar to the existing Interagency Appraisal Guidelines (IAG). It argues that just as IAG established standards for appraiser competence, independence, and report content for federally-related real estate transactions, IEG are overdue to establish similar standards for environmental professionals and reports. Several issues are identified that could be addressed through IEG, such as defining environmental professional qualifications, establishing standards for different types of environmental reports, and identifying high-risk property types requiring environmental assessments. The lack of IEG is described as a "weak link" in the real estate lending process.