[t]he property of a system (including all of its system resources) that ensures that the actions of a system entity may be traced uniquely to that entity, which can be held responsible for its actions.[3]
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[t]he quality or state that enables attempted and committed violations of computer systemssecurity to be traced to individuals who may then be held responsible.[4]
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[the] [p]rinciple that responsibilities for ownership and/or oversight of IS resources are explicitly assigned and that assignees are answerable to proper authorities for stewardship of resources under their control.[5]