The four articles, entitled "Assessing and Managing the Terrorism Threat," "Engaging the Private Sector to promote Homeland Security: Law Enforcement-Private Security Partnerships," "Intelligence-led Policing: The New Intelligence Architecture," and "Mutual Aid: Multijurisdictional Partnerships for Meeting Regional Threats," all address different areas of counterterrorism law enforcement. The first paper presents the components of risk assessment and management. Protocols are offered that help with the calculation of criticality, vulnerability, threat, and risk and resources are extended for agencies developing these skills. A utilitarian risk management methodology is presented and promising local practices that are being adapted to implement the Department of Homeland Security's State Homeland Security Assessment and Strategy Program are described. The second paper addresses why partnerships between private security and public law enforcement are important to homeland security efforts. The benefits of law enforcement-private security partnerships are enumerated and guidelines are offered for planning effective partnerships. Profiles are presented of numerous local, regional, State, and Federal programs featuring effective law enforcement-private security collaborations. The third paper underscores the importance of intelligence-led policing and describes the basic steps to developing a criminal intelligence capability. Several success stories from around the country are presented that highlight effective intelligence and analysis operations. The fourth paper discusses the importance of establishing mutual aid agreements across jurisdictional lines and discusses how to establish mutual aid agreements, including their terms and conditions. The barriers to effective cross-jurisdictional collaboration efforts are described, including mistrust and unclear limits regarding the scope of the agreement. Predeployment considerations and the steps involved in activating mutual aid plans are outlined.