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Reliability Models for Almost-Series and Almost-Parallel Systems

When assessing system reliability using system, subsystem, and component-level data, assumptions are required about the form of the system structure in order to utilize the lower-level data. We consider model forms which allow for the assessment and modeling of possible discrepancies between reliability estimates based on different levels of data. By understanding these potential conflicts between data, we can more realistically represent the true uncertainty of the estimates and gain understanding about inconsistencies which might guide further improvements to the system model. The new methodology is illustrated with several examples.