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Criteria and indicators are frequently used for assessing the resilience of critical infrastructure (CI). Moreover, to generate precise information on conditions, the assessment designed for CI resilience could rely on indicator systems. However, few practical tools exist for guiding CI managers to build specific indicator systems for considering real cases. Therefore, the main objective of this study is to develop a step-by-step guide that contains guidance on operational steps and required resources for criteria and indicator setting, reference definition, and data collection. This guide enables CI managers to build systems of indicators tailored to different real cases. This guide could assist CI managers in their decision-making process, as it is structured based on a multi-criteria framework that takes into account the cost–benefit analysis and side effects of implementable actions. This guide could furthermore advance the application of indicator-based CI resilience assessment in practical management. In addition, this study provides an example to demonstrate how to use this guide. This example is based on specific circumstances for the Nantes Ring Road (NRR) network: when the ring road is flooded and closed, the road network manager suggests alternative roads to the public. An indicator system consisting of 4 criteria, 7 sub-criteria, and 11 indicators was built for these circumstances using the guide developed in this paper. This example relates to criteria and indicators in the technical, social, and environmental dimensions and involves 62 676 data points. [ABSTRACT FROM AUTHOR]

Criteria and indicators are frequently used for assessing the resilience of Critical Infrastructures (CIs). However, the application of the concept of CIs resilience in practical disaster management is challenged by the lack of operational tools. An operational tool should enable the establishment of an organized system of indicators and optimising operational practice. Therefore, to address the operationalisation of resilience assessment, the main objective of this study is to develop a step-by-step guide for the creation of specific indicators aimed at different practical situations. This guide can assist CIs managers in their decision-making as it is structured based on a multi-criteria framework that considers the various interests of stakeholders. This guide includes the methods for Criteria and indicators setting, reference definition, and data collection. Furthermore, this study presents an example of the application of the guide. This example is based on a given scenario focusing on the Nantes Ring Road (NRR) network: when it is flooded and closed, the road network manager suggests alternative roads to citizens. The created indicators, based on this scenario and involved 62 676 data, relate to potential damages and costs-benefit and involve technical, social, and environmental dimensions. [ABSTRACT FROM AUTHOR]