Critical Infrastructure Interdependencies Assessment Using Graph Dynamic Agent-based Inoperability Input-output Model

1. INTRODUCTION Infrastructure systems such as electric power, gas and energy, water distribution, wastewater, transportation networks and telecommunications systems are critical to the welfare, economy and security of every developed country. Protecting these critical infrastructures is one of the main challenges for governments and international organizations. In order to develop robust infrastructure protection strategies, it is important to identify and understand the global behavior and intrinsic weaknesses of these systems and their components. Because of the overwhelming complexity of critical infrastructures, it is necessary to model and analyze the mutual relationships that exist within an infrastructure and between infrastructures. These dependencies are often implicit, hidden and poorly understood by infrastructure owners and operators as well as domain experts. So, understanding and modeling the interdependencies are crucial to identifying structural vulnerabilities and implementing adequate protection and mitigation strategies.