TopEvent FTA is interactive software for Qualitative and Quantitative Fault Tree Analysis. It supports both coherent and non-coherent fault trees. TopEvent FTA incorporates two Fault Tree evaluation methods: The Classical Minimal Cut Sets Method (Classical MCSs Method) and the Binary Decision Diagram Method (BDD Method).

A fault tree is a graphical diagram that uses logic gates to model the various combinations of failures, faults, errors and normal events involved in causing a specified undesired event to occur. The fault tree analysis method is mainly used in the fields of safety engineering and reliability engineering to understand how systems can fail, to identify the best ways to reduce risk or to determine event rates of a safety accident. Fault tree analysis is used in the aerospace, nuclear power, chemical and process, pharmaceutical, petrochemical and other high-hazard industries. The fault tree model can be translated into a mathematical model in order to compute failure probabilities and system importance measures. A fault tree can model all aspects of a system, including hardware, software, human actions and the environment.

You can easily create complex Fault Trees with the TopEvent FTA Fault Tree Editor. The Fault Tree Editor includes two Views: the standard Fault Tree Diagram View and the Tree List View. These Views provide a full overview of the Fault Tree. TopEvent FTA allows you to create both coherent and non-coherent fault trees.

TopEvent FTA can calculate the exact values of the Unavailability and Importance Factors. The Quantitative Fault Tree Evaluation can be obtained via the Classical Minimal Cut Sets Method or the Binary Decision Diagram Method. The BDD Method provides the exact values of the Unavailability and Importance Factors, and the Classical Method provides a rare event approximation of the probabilities.