The Section 106 regulations, “Protection of Historic Properties,” (36 CFR Part 800), offer program alternatives through which agencies can tailor the Section 106 review process for a group of undertakings or an entire program that may affect historic properties. This chart compares and contrasts the five program alternatives in terms of their objectives; roles and responsibilities for agency, ACHP, other stakeholders, and the public; approval action; and time frames for development.