ehrst
Ehrst is a term used in theoretical discussions of complex systems to denote a composite resilience metric for distributed networks. In its common usage, ehrst serves as a shorthand for assessing how quickly a system can absorb shocks, adapt to changing conditions, and recover after disruptions. The metric is designed to be agnostic about the underlying technology, applying to computer networks, power grids, or social-technical systems.
The etymology of ehrst is uncertain; the term first appeared in late 2010s technical notes and has
Conceptually, ehrst combines four components: exposure to perturbations, hazard level, recoverability, and systemic stability. A typical
In practice, ehrst is used in simulation studies to compare design choices, such as redundancy, modularity,
See also: resilience, complex networks, risk assessment, system dynamics.