; and (D) a metrics and analysis process to be used to measure the Nation’s ability to manage and reduce terrorism risks to critical infrastructure. (3) Relationship to other provisions The plan shall reflect the terrorism threat identification, prevention, mediation, and recovery relationships within the Department of Homeland Security and across the Federal Government identified under this Act and the updates to the public-private partnership model under this Act. (4) Energy and communication systems The plan shall consider sector dependencies on energy and communications systems during a terrorism event, and identify pre-event and mitigation measures or alternate capabilities during disruptions to those systems. (5) Coordination The Secretary shall coordinate activities under this subsection with the SSAs, other relevant Federal departments and agencies, SLTTs, and critical infrastructure owners and operators. (6) Response plans The plan shall include an analysis of the feasibility of developing terrorism response plans, based on research conducted on the resilience of critical infrastructure when faced with terrorism threats, that focus on action plans to achieve a level of function and eventual recovery of full operability of critical infrastructure post-cyber attack. (f) National critical infrastructure security and resilience R&D plan Within 2 years after the date of the enactment of this Act, the Secretary of Homeland Security, in coordination with the Office of Science and Technology Policy, the SSAs, the Department of Commerce, and other Federal departments and agencies, shall provide to the President, through the Assistant to the President for Homeland Security and Counter­terrorism, a National Critical Infrastructure Security and Resilience Research and Development Plan that takes into account the evolving threat landscape, annual metrics, and other relevant information to identify priorities and guide research and development requirements and investments. The Secretary shall reissue the plan every 4