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Reliability is defined as " the probability that a system or equipment will perform its intended function for a stated period under stated conditions" .
On the basisi of maintenance we can say relibility engineering as "the sceince of maintennace".
Reliability is a design function. By maintennace we can only achieve its design values and cannot improve beyond that.
Reliability is defined as" ability of component or system or network or management to perform desired function under stated environment condition over period of time.
OR
Reliability is defined as "FAILURE FREE operation/work of a component/systems/network/management" under stated environment condition over intervel of time.
reliability is facilitie to management, it means that any management to perform desire task as failure free in given period of time intervel.
reliability engineering is mainly facilite to management to provide"estimation and prevention of management at high level of failures"
Reliability is generally expected; the problem is end users expect that a product or system will work and go on working over its predicted life. With the anticipated life of some products and systems being in years if not decades, long life needs to be an even more fundamental part of the process.
Even after entry into service, measures must be employed to ensure that continued operation is maintained.
The reduction of operational costs and continued operation of equipment beyond their design lives becomes even more vital.
