Abstract
Abstract The overall reliability of a complex system, designed as an assembly of subsystems, depends on the subsystem reliability metrics. The cost of each subsystem is a function of its reliability. This article considers the problem of allocating the reliability values to minimize the total cost while achieving the reliability target. The reliability allocation problem is applicable to mechanical and electrical systems as well as computer hardware and software. The approach involves expressing the system reliability in terms of the subsystem reliability values and specifying the cost function for each subsystem, which allows setting up an optimization problem. Software reliability allocation is examined as a detailed example and some preliminary apportionment approaches are presented. While in many cases, it is possible to use exact optimization methods, a complex case may require use of iterative approaches.
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