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This method allows the laboratory data to be combined with the generic data from Method I.
The procedure to determine the overall system level or equipment failure rate is to sum, or roll up, the individually calculated failure rates for each device and then unit. Therefore, the predictions made at the lower hierarchy are used to feed predictions at the higher unit and system levels.
The above procedure calculates the predicted failure rate at the actual operating conditions for each component in the project.
The Bellcore procedure provides three methods for predicting device and unit reliability.
Method III - Use Method III if field tracking reliability data is available for some or all the devices or units.
As above, this method will allow actual field reliability data to be combined with the generic data to obtain predictions.