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European Definitions

DIESIS project

The DIESIS project [1] gives the following definition:

"Two infrastructures are logically dependent if the state of each depends on the state of the other via a mechanism that is not a physical, cyber, or geographic connection." [2]

Other International Definitions

United Nations’ Definition

National Definitions


Estimate of the potential of an incident or event’s occurrence [3].

Standard Definition

Chance of something happening [4].

Discussion Topic

See also


  2. Rinaldi, S., J. Peerenboom, and T. Kelly (2001). Identifying, understanding and analysing critical infrastructure interdependencies. IEEE Control Systems Magazine, pp. 11–25.
  3. DHS Risk Lexicon 2010 Edition, September 2010
  4. ISO Guide 73:2009 Risk management -- Vocabulary