This specific session within MODSIM will discuss Homeland Security & Emergency Management applications of modelling and simulation. It results from a splitting of the successful Defence and Homeland Security session into Defence and non-Defence areas. This new session seeks papers applying modelling and simulation to all areas of Homeland Security, including (but not limited to) agent-based modelling, simulation of social systems, applications to critical infrastructure protection & emergency management, and modelling of crime, fraud, terrorism, pandemics & natural disasters.