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According ISO/IEC PDTR 24772 Section 6.47, "REU Termination strategy" says:

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Expectations that a system will be dependable are based on the confidence that the system will operate as expected and not fail in normal use. The dependability of a system and its fault tolerance can be measured through the component part's reliability, [availability|BB. Definitions#availability], safety and security. Reliability is the ability of a system or component to perform its required functions under stated conditions for a specified period of time \[[IEEE

1990 glossary. Availability is how timely and reliable the system is to its intended users. Both of these factors matter highly in systems used for safety and security. In spite of the best intentions, systems will encounter a failure, either from internally poorly written software or external forces such as power outages/variations, floods, or other natural disasters. The reaction to a fault can affect the performance of a system and in particular, the safety and security of the system and its

Std 610.12 1990|AA. C References#IEEE Std 610.12 1990]\]. Availability is how timely and reliable the system is to its intended users. Both of these factors matter highly in systems used for safety and security. In spite of the best intentions, systems will encounter a failure, either from internally poorly written software or external forces such as power outages/variations, floods, or other natural disasters. The reaction to a fault can affect the performance of a system and in particular, the safety and security of the system and its users.

Effective error-handling (which includes error reporting, report aggregation, analysis, response, and recovery) is a central aspect of the design, implementation, maintenance, and operation of systems that exhibit survivability under stress.  Survivability is the capability of a system to fulfill its mission, in a timely manner, despite an attack, accident, or other stress that is outside the bounds of normal operation \[[Lipson 00|AA. C References#Lipson 00]\].  If full services can't be maintained under a given stress, survivable systems degrade gracefully, continue to deliver essential services, and recover full services as conditions permit.

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