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In earlier times, a favorite way of partially relating the reliability concept was to use an analogy of a chain with some number of links in series explaining that the strength of the chain is no greater than the strength of any one of its links. The weakest link determines the strength of the chain. Therefore, to the reliability mind of the time, it made little sense to manufacture a chain with one or more links having significantly greater strength than the other links. There was a tendency to employ this thought process to complex electronic hardware systems, with the chain corresponding to the system and the links corresponding to the components in the system.