Interdependency

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The terms interdependency and dependency are often used in the CIP literature as synonymous. See also dependency. Interdependency is a mutual dependency. As such it seldom occurs!

One of the most cited definitions of interdependency is the one by Rinaldi et al. who define interdependency as a

bidirectional relationship between two infrastructures through which the state of each infrastructure influences or is correlated to the state of the other [1].


Definitions

European Definitions

EU

This definition is adopted on the Commission's staff working document on a new approach to the EPCIP [2]:

Interdependencies can be identified "between critical infrastructures, industry, and state actors".

The working document also highlights that threats to a single Critical Infrastructure can have "a very significant impact on a broad range of actors in different infrastructures and more widely". The document also highlight the cross-border effect of interdependencies, spanning a number of European countries. The example identified in the document is the European high-voltage electricity grid, composed of the interconnected national high-voltage electricity grids.

European Project Definitions

CIPRNet project

The CIPRNet project [3] uses the following definition:

Interdependency is the mutual dependency of products or services (ACIP, 2003).


National Definitions

Australia

Inter-dependency is the series of supply-orientated relationships that exist between distinct systems that, when altered, affect their continued operation. [4]


New South Wales
Interdependency: When multiple critical infrastructures rely on each other for continued service provision. [5]


Brazil

Interdependência: relação de dependência ou interferência de uma infraestrutura crítica em outra, ou de uma área prioritária de Infraestruturas Críticas em outra. [6]

Interdependence: dependency relationship or interference of a critical infrastructure with another, or of a Critical Infrastructure priority area with another.



Germany

Interactions or mutual influences between different Critical Infrastructures. [7]


An older definition was:

Interdependency is the complete or partial mutual dependency of several goods or services [8].



Ireland

Interdependency is a mutually dependent relationship. [9]

Dependency and Interdependency can be defined as relationships which consider the cascading effect within sector/sub-sectors and/or across sectors/sub-sectors

Italy

Interdipendenza: relazione funzionale tra due sistemi o infrastrutture attraverso la quale lo stato di ogni infrastruttura è correlato allo stato dell’altra, influenzandolo ed essendone reciprocamente influenzato. [10]



Kosovo

Interdependency: Means the total or partial mutual dependency of several goods or services. [11]


Republic of Trinidad & Tobago

Mutually reliant relationship between entities (objects, individuals, or groups). [12]

The degree of interdependence does not need to be equal in both directions.

Spain

Interdependencias: los efectos que una perturbación en el funcionamiento de la instalación o servicio produciría en otras instalaciones o servicios, distinguiéndose las repercusiones en el propio sector y en otros sectores, y las repercusiones de ámbito local, autonómico, nacional o internacional. [13]



United States

Interdependency. Mutually reliant relationship between entities (objects, individuals, or groups); the degree of interdependency does not need to be equal in both directions. [14]



Mutually reliant relationship between entities (objects, individuals, or groups). [15]
The degree of interdependency does not need to be equal in both directions. For example, the Energy Sector depends on a functioning Water Sector for successful day-to-day operations, just as the Water Sector needs energy to effectively manage water and wastewater systems [16]



Discussion

Empirical analysis of Critical infrastructure incidents and events by Van Eeten et al. [17], and again by Luiijf and Klaver (2021) [18] shows that interdependencies (= the mutual Dependency) hardly occur; and when they occur the effect is at a lower (weaker) dependency level.

See also

Notes

References

  1. ↑ Steven M. Rinaldi, James P. Peerenboom, Terrence K. Kelly, Identifying, Understanding and Analysing Critical Infrastructure Interdependencies, IEEE Control Systems Magazine, December 2001, p.14.
  2. ↑ Staff Working Document on a new approach to the European Programme for Critical Infrastructure Protection - Making European Critical Infrastructures more secure, SWD(2013) 318 final, Brussels, 28.8.2013
  3. ↑ http://www.ciprnet.eu/
  4. ↑ Glossary of the Government of Queensland
  5. ↑ NSW Critical Infrastructure Resilience Strategy Partner, Prepare, Provide (2018)
  6. ↑ GUIA DE REFERÊNCIA PARA A SEGURANÇA DAS INFRAESTRUTURAS CRÍTICAS DA INFORMAÇÃO Versão 01 (Nov. 2010).
  7. ↑ Protection of Critical Infrastructures – Baseline Protection Concept: Recommendation for Companies, BMI.
  8. ↑ UP KRITIS, BSI, 2014
  9. ↑ Strategic Emergency Management 2019
  10. ↑ PROTEZIONE DELLE INFRASTRUTTURE CRITICHE INFORMATIZZATE La realtà Italiana (2004)
  11. ↑ National Cyber Security Strategy and Action Plan 2023 – 2026 (2023)
  12. ↑ Comprehensive Disaster Management Policy Framework for Trinidad and Tobago
  13. ↑ 7630 Ley 8/2011, de 28 de abril, por la que se establecen medidas para la protección de las infraestructuras críticas.
  14. ↑ NIPP Directive (DHS Lexicon, 2010)
  15. ↑ DHS Risk Lexicon 2010 Edition, September 2010
  16. ↑ Critical Infrastructure Protection and Resilience Toolkit (Glossary), US Department of Homeland Security
  17. ↑ THE STATE AND THE THREAT OF CASCADING FAILURE ACROSS CRITICAL INFRASTRUCTURES: THE IMPLICATIONS OF EMPIRICAL EVIDENCE FROM MEDIA INCIDENT REPORTS, MICHEL VAN EETEN,ALBERT NIEUWENHUIJS,ERIC LUIIJF,MARIEKE KLAVER,EDITE CRUZ (2011)
  18. ↑ Analysis and lessons identified on critical infrastructures and dependencies from an empirical data set, Luiijf and Klaver, 2021


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