Defense in depth (glossary)
A system resilience principle that states that a system should be capable of having two or more ways to address a single vulnerability. Jackson (2016)
Source
Jackson, Scott. 2016. "Principles for Resilient Design - A Guide for Understanding and Implementation." In IRGC Resource Guide on Resilience, edited by I. Linkov. University of Lausanne, Switzerland.
Discussion
Also called layered defence