; (H) evaluate interdependencies and cascading impacts related to electric grid failures; (I) support post-terrorism incident management and restoration efforts related to critical infrastructure; and (J) make recommendations on preventing the collapse or serious degrading of the telecommunication capability in an area impacted by a terrorism event. (11) Support the Department of Homeland Security’s ability to maintain and share, as a common Federal service, a near real-time situational awareness capability for critical infrastructure that includes actionable information about imminent terrorist threats, significant trends, and awareness of incidents that may impact critical infrastructure. 4. Definitions For purposes of this Act: (1) Critical infrastructure The term critical infrastructure means systems and assets, whether physical or virtual, so vital to the United States that the incapacity or destruction of such systems and assets would have a debilitating impact on security, national economic security, national public health or safety, or any combination of those matters. (2) Resilience The term resilience means the ability to prepare for and adapt to changing conditions and withstand and recover rapidly from disruptions. The term includes the ability to withstand and recover from deliberate attacks, accidents, or naturally occurring threats or incidents. (3) Sector-specific agency The term sector-specific agency means a Federal department or agency designated as a Sector-Specific Agency by Presidential Policy Directive 21, relating to Critical Infrastructure Security and Resilience. (4) Security The term security means reducing the risk to critical infrastructure by physical means or defense cyber measures to intrusions, attacks, or the effects of terrorist intrusions or attacks.