This document serves as a high-level guide for Homeland Security Advisors (HSAs), State Administrative Agencies (SAAs), Urban Area Working Groups (UAWGs), regional groups and coalitions, and other agency leads with responsibilities that include aspects of infrastructure protection. The roles and responsibilities of these CIKR partners differ by State and region, depending on whether the area of concern crosses State or international borders, the authorities supporting each agency, and the way in which homeland security and infrastructure protection are addressed, managed, and funded in each area. In addition, much of the information presented will be useful to those responsible for homeland security practices and initiatives at the local, tribal, or territorial level. Application at these levels also will vary based on the many different forms of government (town, city, county, township, tribe, etc.), the local delegations of authority, budget constraints, and the numbers and types of critical infrastructure and key resources (CIKR) within any given community. This document is not intended to be prescriptive or to impose requirements on the States, communities, or other CIKR partners. Rather, it suggests various strategies and approaches, and leaves it to the discretion of each jurisdiction to determine which approach or combination of approaches, if any, might be suited to their specific needs, operating environments, and risk landscapes."