Which of the following tools begins at the point of failure and works back through the process to the components?

Fault Tree Analysis (FTA) is a top-down, deductive failure analysis methodology. It begins with a specific, undesirable top-level event (the point of failure) and systematically traces backward to identify all possible contributing causes, including component failures, human errors, and environmental factors. The analysis uses Boolean logic gates to model the relationships between these events, creating a tree-like diagram. This structure visually represents how lower-level faults can propagate up to cause the top-level failure, perfectly matching the description of working back from a failure to its component causes.

B. Pugh matrix: This is a decision-making tool used for concept selection by comparing multiple alternatives against a baseline set of criteria, not for failure analysis.

C. Cause and effect matrix: This tool is used to prioritize the relationships between process inputs (causes) and outputs (effects) but does not start from a single failure event.

D. Kappa analysis: This is a statistical measure (Cohen's Kappa) used to assess inter-rater reliability and agreement, which is unrelated to failure analysis methodology.

1. Vesely

W. E.

Goldberg

F. F.

Roberts

N. H.

& Haasl

D. F. (1981). Fault Tree Handbook. NUREG-0492. U.S. Nuclear Regulatory Commission. In Section I

page I-1

it states

"Fault tree analysis is a deductive

top-down method of analyzing system design and performance. It involves specifying a top event to be analyzed... and identifying all the associated elements in the system that could cause that top event to occur."

2. Ericson

C. A. (2016). Hazard Analysis Techniques for System Safety. John Wiley & Sons. In Chapter 13

"Fault Tree Analysis

" the process is described as starting with the "final mishap or failure (called the top event)" and working "backwards in time to determine the possible causes of the top event." (p. 289).

3. University of Maryland

A. James Clark School of Engineering. (n.d.). ENME 489V: Introduction to Reliability Engineering

Lecture 10: Fault Tree Analysis. The lecture notes describe FTA as a "top-down approach to failure analysis" that "starts with an assumed failure" and determines the "causes for the failure." (Slides 3-4).