A study concerned with automatic equipment that is being developed to diagnose malfunctions in equipment and to locate faulty parts. For use as an adjunct to the usual engineering-logic method of programming for fault location, this paper develops search rules, founded on probabilistic concepts, that show the preferred order of conducting tests to find the fault in the shortest time. A two-step search process is used, finding first the faulty module, and then the faulty component within the module.
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