4.1. Introduction to Legal Foundations.This Section explains the legal foundations for Sections 1, 2, and 3. It is written for both lawyers and non-lawyers—including appraisers, who must correctly apply federal law in the development, reporting, and review of market value appraisals in federal acquisitions. This Section discusses the legal standards that govern many recurring valuation problems, and provides guidance on specialized appraisal issues that are unique to federal acquisitions. The legal foundations discussed here hold significance even for those who are not bound to follow these Standards but must adhere to the federal law these Standards summarize and explain.