Redundancy

Redundancy is a technique for avoiding failure by putting backup systems in place that can take over if a primary system fails. For example, many redundant systems are used on the space shuttle to protect the crew if a primary system fails.

Definition

According to Managing Quality by Foster (6th edition),

Redundancy. A technique for avoiding failure by putting backup systems in place that can take over if a primary system fails. For example, many redundant systems are used on the space shuttle to protect the crew if a primary system fails.

According to Juran's Quality Handbook by Defeo (7th edition),

Redundancy. The existence of more than one element for accomplishing a given task, where all elements must fail before there is an overall failure of the system.