ABSTRACT: This chapter addresses selected issues of strategic resilience of Industry 4.0 process installations and critical infrastructure systems that are designed and operated using converged technologies OT/IT/CT (operational technology/information technology/cloud technology) for effective business management in changing and uncertain environment. Two kinds of strategic resilience are distinguished: (I) the resilience concerning business processes to be evaluated and supported applying in industrial practice, e.g., a methodology of business continuity management (BCM), and (II) the resilience related to the safety and security technologies. Selected issues of these two areas of the overall resilience are discussed in relation to current references and reports. In area (II) the resilience of industrial automation and control systems (IACS) is emphasized that includes the requirements imposed on solutions of the functional safety (FS) and cybersecurity (CS) to be designed according to the defence in depth (DinD) concept using defined protection layers (PL). Responsible tasks in abnormal and accident situations are executed by the human operators that make use of an alarm system (AS) and its interface within overall human system interface (HSI). The human error probability (HEP) for relevant human operator behaviour type is evaluated using a human cognitive reliability (HCR) model. It is concluded that the resilience engineering (RE) concept is useful, but additional research effort is needed to develop integrated approaches and tools for supporting real engineering and organisational issues of strategic resilience.

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