"The National Infrastructure Simulation and Analysis Center (NISAC) is a modeling, simulation, and analysis program that prepares and shares analyses of critical infrastructure and key resources including their interdependencies, vulnerabilities, consequences of disruption, and other complexities. NISAC is under the direction of the Department of Homeland Security's (DHS) Office of Infrastructure Protection (OIP). Sandia National Laboratories (SNL) and Los Alamos National Laboratory (LANL) are the prime contractors for NISAC, integrating the two laboratories' expertise in the modeling and simulation of complex systems for evaluating national preparedness and security issues. NISAC activities include: (1) Infrastructure modeling and analysis (2) Decision support tools (3) Knowledge management (4) Fast turnaround analyses". (Sandia National Laboratories, National Infrastructure Simulation and Analysis Center, 2008)