الفهرس 
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Abstract
In measuring reliability, we are observing lifetimes of products or system of interest. In order to gain a sound knowledge about the product or system failure time distributions, life testing and reliability experiments are carried out before products are put in the market or system is used. Life testing, experimentation is a practical way to determine the product reliability and product quality. A life-testing experiment is one in which a sample of the item of interest is subjected to stresses and environmental conditions that epitomize the intended operating conditions. During the life test, successive times to failure are noted and lifetime data are collected. These lifetime data are used to estimate certain parameters, to make predictions or to make decisions on accepting a batch of items.