Fault tree analysis

Japanese: fault tree analysis(英語表記)faulttreeanalysis
Fault tree analysis

...If FMEA has already been performed in reliability analysis, the criticality is reevaluated from a safety standpoint, and if analysis necessary for safety is added, it is called "failure hazard analysis."
[Fault tree analysis (FTA)]
FTA is a method of analyzing the source (input) and the path of its occurrence by taking the undesirable event (output) as the apex and gradually expanding it like the branches of a tree toward the source. If the probability of occurrence of all inputs can be decomposed down to events (called basic events) whose occurrence probability can be quantitatively estimated, the output can be quantitatively estimated.
[Event tree analysis (ETA)]
ETA is a graphical analysis method that, unlike FTA, analyzes what events (outputs) will develop over time if a failure (input) occurs in a component. If the probability of each event occurring can be estimated, quantitative analysis is also possible.

*Some of the terminology that refers to "fault tree analysis" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…信頼性解析ですでにFMEAが実施されていれば,安全性の見地から致命度の再評価を行い,安全性上必要な解析を追加した場合は〈故障ハザード解析〉といわれる。
[故障の木解析――フォールトツリーアナリシスfault tree analysis(略称FTA)]
 FTAは,その発生が好ましくない事象(出力)を頂点に取り上げ,木の枝のようにしだいに源泉の方に図式に展開して,その発生源(入力)およびその発生経路を解析する方法で,すべての入力の発生確率が定量的に推定できる事象(基本事象という)まで分解できると定量的に出力を推定することができる。
[事象の木解析――イベントツリーアナリシスevent tree analysis(略称ETA)]
 ETAは,FTAとは逆に構成要素に故障(入力)が発生したとして,時間の経過をたどり,どんな事象(出力)に発展するかを解析する図式解法で,各事象の発生確率が推定できると定量的な解析もできる。…

※「fault tree analysis」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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