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reliability

   Also found in: Dictionary/thesaurus, Medical, Legal, Acronyms, Wikipedia 0.02 sec.

reliability

The trustworthiness to do what the system is expected or designed to do. Reliability metrics include the following averages:

POFOD (probability of failure on demand)
The likelihood that the system will fail when a user requests service. A biometric authentication device that fails to correctly identify or reject users an average of once out of a hundred times has a POFOD of 1%.

ROCOF (rate of failure occurrence)
The number of unexpected events over a particular time of operation. A firewall that crashes an average of five times every 1,000 hours has a ROCOF of 5 per 1,000 hours.

MTTF (mean time to failure)
The average time between unexpected events. If an IDS fails on average every 300 hours, its MTTF is 300 hours.

AVAIL (availability or uptime)
The percentage of time that a system is available for use, taking into account planned and unplanned downtime. If a system is down an average of four hours out of 100 hours of operation, its AVAIL is 96%.

reliability [ri‚lī·ə′bil·əd·ē]
(engineering)
The probability that a component part, equipment, or system will satisfactorily perform its intended function under given circumstances, such as environmental conditions, limitations as to operating time, and frequency and thoroughness of maintenance for a specified period of time.
(statistics)
The amount of credence placed in a result.
The precision of a measurement, as measured by the variance of repeated measurements of the same object.
(system)reliability - An attribute of any system that consistently produces the same results, preferably meeting or exceeding its specifications. The term may be qualified, e.g software reliability, reliable communication.

Reliability is one component of RAS.


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? Mentioned in ? References in classic literature
 
In the perilous uncertainty of our present situation, it is hard to say what future interests may not depend upon the regularity of the entries in my journal, and upon the reliability of my recollection at the time when I make them.
The Woman in White by Collins, Wilkie View in context
I cannot think that there is sufficient certainty of their reliability in this negative observation to make us accept a difficult and revolutionary view of thought, merely because they have failed to observe the presence of words or their equivalent in their thinking.
The Analysis of Mind by Russell, Bertrand View in context
There's a bright and ready twinkle in his eye, there's a neatness in his action, there's a smartness in his figure, there's an air of reliability about him in case you wanted a basin, which points out the steward
Our Mutual Friend by Dickens, Charles View in context
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