Environment Systems and Decisions

, Volume 35, Issue 2, pp 279–290 | Cite as

Defining resilience using probabilistic event trees

  • Horia-Nicolai L. Teodorescu


The concept of resilience and various aspects related to resilience enhancement and resilience calculus are addressed in the context of the broader theme of reliability and disaster mitigation. A definition of resilience is proposed, based on the assessment of event trees and the statistical determination of risks. Essentially, we apply standard probabilistic models with conditional probabilities, event trees and fault trees, where faults are not limited to technological ones, but cover lack of personnel as well, to define the resilience in a systematic manner. An essential aspect of the approach is the estimation of the probability of recovery in a specified time frame. The time to recovery and the level of recovery play key roles in the definition. The main assumptions underlying the calculations are discussed. A synthetic resilience indicator is introduced to offer a short, easy to grasp clue on the resilience level, with the aim to facilitate planning for resilience. An analysis methodology is suggested under general conditions, and several examples of applications are given.


Quantitative analysis Resilience indicator Probabilistic model Event tree Chained disasters Factors of resilience 



This paper makes use of some of the knowledge gained at the NATO ARW (Advanced Research Workshop) on “Improving disaster resilience and mitigation” (see Teodorescu et al. 2014) and relies on the conclusions drawn at that ARW. Partially, this research was supported by the multi-annual NATO Grant SPS 984877. I am grateful to four anonymous referees who essentially contributed to the improvement of the paper.

Conflict of interest



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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Institute of Computer Science of the Romanian Academy (Iasi Branch)IasiRomania
  2. 2.“Gheorghe Asachi” Technical University of IasiIasiRomania

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