The Isolation Effectiveness calculation that appears in the Fault Group Size Percentages section of the Fault Isolation Report quantifies how well the diagnostic sequence in the current diagnostic study is able to isolate to a fault group containing a single repair item. It provides the worst-case likelihood that the given diagnostics will result in the removal of a failed item. In other words, this Test limit represents the expected percentage of correct removals if the current diagnostics were to be employed using the Block Replacement approach to maintenance and if failures were to always occur one at a time (thereby resulting in at least one false removal each time that a multi-item fault group is replaced).
Calculation
Isolation Effectiveness (with respect to isolation to fault groups of size one) can be calculated using the following equation:
