The invention is a truth table-based failure isolation matrix in an Automated Test Equipment (ATE) environment to enable the mapping of measured results and/or test outcomes to probable causes of failure (PCOF). The failure isolation matrix is hierarchical in that it applies to both individual tests as well as groups of tests. For each level in the hierarchy, columns represent individual outcomes verified against expected results to produce a resultant outcome and rows represent possible combinations of measurement outcomes or outcome vectors. For groups of tests, the measurement results represent the combined results of the individual tests within the test group. The resultant matrix is a pattern of vectors that can be pattern matched against prior history of result patterns to further improve the accuracy and narrow the scope of PCOF.
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