For critical infrastructure restoration planning

the real-time scheduling and coordination of system restoration efforts

the key in decision-making is to prioritize those critical components that are out of service during the restoration. For this purpose

there is a need for component importance analysis. While it has been investigated extensively for individ-ual systems

component importance considering interdependence among transmission

distribution and communication (T&D&C) systems has not been systematically analyzed and widely adopted. In this study

we propose a component importance assessment method in the context of interdependence between T&D&C networks. Analytic methods for multilayer networks and a set of metrics have been applied for assessing the component impor-tance and interdependence between T&D&C networks based on their physical characteristics. The proposed methodology is further validated with integrated synthetic Illinois regional trans-mission

distribution

and communication (T&D&C) systems

the results reveal the unique characteristics of component/node importance

which may be strongly affected by the network topology and cross-domain node mapping.