N o F ault F ound

Abstract

Abstract This article describes the No Fault Found (NFF) phenomenon that occurs when a system is tested after a failure is reported but no failure is found during the test. This basic phenomenon is known by a large number of terms, which are often abbreviated to three letter acronyms, and are described in this article. The level of occurrence of such false positive faults in various technical fields is described and a number of possible reasons for the incidence are discussed. Finally a discussion of the management of such faults within the context of quantitative risk assessment is included.

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