What are domain and infrastructure interdependencies and why are they important?

The United States’ critical infrastructures [communications, transportation, power, etc.] and domain interdependencies are connected as a “system of systems”. These systems are mutually dependent in complex ways. By mapping the infrastructure and domain interdependencies, government and business leaders can prioritize and make decisions that will minimize disruptions.

For example, during a hurricane, electrical power is lost. There isn’t sufficient diesel to power hospital generators beyond 2–3 days. There is a fuel shortage caused by supply chain disruptions, and roads and bridges are closed due to sustained damage; trucks therefore can’t deliver diesel to hospitals to power the generators. Delivery of basic healthcare supplies is also impacted by the fuel shortage and inaccessible roads. No diesel, no truck deliveries and no basic healthcare supplies will negatively impact healthcare in the entire area within 36 to 48 hours.