Generic Parts Count Method
The Generic Parts Count method is based on the principle that the reliability of any item depends upon the number of parts comprising the item, the failure rates of the individual parts and the environments in which the item is to be used. Basic assumptions of the method are that part failure rates are constant with time, and part failures are independent of each other. Part failure rates are calculated by multiplying base failure rates by an appropriate environmental factor (KE).
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The term parts is used here in its widest sense and includes electronic components, microelectronic devices, mechanical items, one-shot devices, etc..
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The Generic Parts Count method can be used from that stage in a project at which part listings start to become available and onwards. Before detailed lists are available, the method can be applied using estimates of part populations based on previous experience; clearly, however, such an evaluation will provide only a broad estimate of reliability.