Functional redundancy (glossary)

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A system resilience principle that states that there should be two or more different ways to perform a critical task. Jackson and Ferris (2013)

Source

Jackson, Scott, and Timothy Ferris. 2013. "Resilience Principles for Engineered Systems." Systems Engineering 16 (2):152-164.

Discussion

Also called design diversity by Leveson (1995) SEBoK v. 1.9.1 released 16 October 2018