Reliability can be defined in terms of a particular point in time or in terms of length of service.

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Reliability can be measured in both terms of a particular point in time and in terms of length of service. For example, a car may be reliable at the moment of purchase, but over time, its reliability may decrease as it accumulates wear and tear. On the other hand, a car with a long track record of consistent performance may be considered highly reliable, even if it has suffered occasional breakdowns or needed repairs.

Reliability Can Be Defined in Terms of a Particular Point