1. A method for optimizing a diagnostic reasoner model for use in connection with a diagnostic system for testing a system under test, the method comprising the steps of: querying for a plurality of primary indicators from the diagnostic system, the plurality of primary indicators identifying one or more potential faults in the system under test; further querying for a plurality of supplemental indicators, each supplemental indicator providing information either validating or invalidating a particular primary indicator or association of primary indicators; and updating the diagnostic reasoner model based at least in part on the supplemental indicators.