Abstract-This paper reviews the literature published on the recent modifications made in the field of risk assessment using Fault Tree Analysis (FTA)in the last decade. This method was developed in 1960's for the evaluation and estimation of system reliability and safety. In this paper we have presented the general procedure for FTA, its application in various fields and the modifications that have been made through the time to overcome the inadequacies of the method. In the last section some of the future wok is also discussed with a simplified methodology.Index Terms-Fault tree analysis (FTA), risk assessment, reliability and safety, hazard analysis, FTA modification.

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