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European Definitions

National Definitions


The one-directional reliance of an asset, system,network, or collection thereof—within or across sectors—on an input, interaction, or other requirement from other sources in order to function properly [1].
Dependency is a uni-directional relationship of two infrastructures through which the state of the depending infrastructure is influenced by or is correlated to the state of the other [2]


IT dependency is defined as the situation where "a process depends on IT if the successful implementation of the process depends on the proper functioning of IT" [3].

See also


  1. National Infrastructure Protection Plan, Partnering to enhance protection and resiliency, US Department of Homeland Security, 2009
  2. Rinaldi, S., J. Peerenboom, and T. Kelly (2001). Identifying, understanding and analysing critical infrastructure interdependencies. IEEE Control Systems Magazine, pp. 11–25.
  3. Unpublished working glossary of UP KRITIS and BSI, 2014