Resilient systems

Resilient systems are systems that absorb disturbances, reorganize their internal structure, and retain essential function without collapsing into a different regime. Resilience is not the same as stability: a stable system returns to its original state after perturbation, while a resilient system may transition to a new configuration that preserves what matters. The distinction matters because many complex systems — ecosystems, power grids, financial networks — cannot return to a prior state after major disruption, yet they can reorganize into viable alternatives. The concept of resilience emerged from ecology but has become central to engineering, where Resilience engineering treats failure not as the absence of safety but as the inevitable consequence of operating in a dynamic environment.