The President s Council on Environmental Quality (CEQ) issued a set of regulations in 1978 to direct federal agencies how to comply with the National Environmental Policy Act (NEPA) these regulations are found at 40 CFR 1500 to 1508. The regulations address both the substantive requirements of NEPA the what and the procedural requirements the how. In addition to describing the analytic process and documentation requirements, the CEQ regulations brought many new terms into the vocabulary and identified many then-new documents. The text of the CEQ regulations is included in full in Appendix D. Included in Chapter 4 are a discussion of the evolution of the NEPA regulations, a description of the various environmental documents required by the CEQ regulations and related terms, a detailed discussion of the content of an environmental impact statement (EIS), and other related information. The discussion in this chapter focuses mainly upon NEPA, the CEQ regulations, the EIS process, and related procedural requirements. Many states and local governments, as well as many other countries, have enacted environmental policy requirements that parallel the federal process; therefore the guidance presented in this chapter is relevant to many of these procedures as well.