In todays world people lives and country well-being are dependent on complex strategic infrastructure. Such infrastructure is called Critical infrastructure. Critical infrastructure includes systems, facilities, and assets so vital that if destroyed or incapacitated would disrupt the security, economy, health, safety, or welfare of the public. Critical infrastructure may cross political boundaries and may be built (such as structures, energy, water, transportation, and communications systems); natural (such as surface or groundwater resources); or virtual (such as cyber, electronic data, and information systems).

For instance, a successful attack on petrochemical sites where hazardous materials storage facilities would cause mass casualties and panic and preventing such likelihood would be of great benefit to the Saudi Homeland Security (SHS) Initiative. Although the risk and consequences vary greatly among these sites, there are a significant number of facilities with tens of thousands of individuals who live and work in the vulnerability zone. This paper presents a system that can be used to evaluate, model and design existing infrastructure in a way to maintain the level of Sensible security. The research findings would greatly contribute to the ongoing efforts of the Saudi Government to establish a security force to guard its oil infrastructure from terrorist threats and attacks.