ANALYSIS TYPE / 07
Top-Down Deductive · Failure Logic · Probability of Violation
Overview
Fault Tree Analysis (FTA) models the logical combination of hardware failures, software faults, and external events that could lead to a system-level hazardous event — providing a structured basis for quantitative probability of failure calculations and safety argument support. Our fault tree models are built directly from the safety goals and system architecture, ensuring that the analysis addresses every safety requirement and provides measurable evidence of compliance with ASIL-level probability targets.
Industries Served
Standards
Key Aspects
Building a top-down logic model from the top-level hazardous event through AND/OR gates to the root failure causes at component or function level.
Identifying all minimal combinations of basic events that are sufficient to cause the top event — revealing single-point failures and critical dependency paths.
Computing the probability of the top event from component failure rates and the Boolean logic of the fault tree — verifying compliance with ASIL-level targets.
Calculating Birnbaum, Fussell-Vesely, and Criticality importance measures to rank basic events by their contribution to system-level failure probability.
Connect with our functional safety team to define the right approach, timeline, and tooling for your project.
