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Test Interference - the set of additional output functions and/or failure modes that are not in a given test's coverage yet, when they fail, could also cause that test to fail. In eXpress, the functions and/or failure modes that make up a test's interference can be classified into three categories: Creation Interference, Propagation Interference and Observation Interference. Note:In a diagnostic study, interference is the most common reason for the difference between minimum and maximum fault detection metrics (see also the Detection Order Report).