Abstract
SYNOPTIC ABSTRACT Reliability engineers search for methods to improve system reliability. The use of redundancy is one of the several ways to improve system reliability. A problem arises when we have to choose the components to which the redundant components are to be added, because the amount of increase in system reliability is different with each component. This article presents a study that solves a redundancy allocation problem in a coherent system considering active redundancy at the component level and develops a general rule to identify the component in a system to which a redundant component is to be added in order to maximize the system reliability. The rule can be applied to add any number of redundant components having independently and identically distributed lives in any simple or complex coherent system. Some examples of various commonly used systems have been discussed to demonstrate how the rule works.
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