Fault-tree-analysis is a human-made analytical method for systematically deducing the combinations of component failures and events that can cause a specified top-level system failure. It is carved by: (1) a boolean logic tree structure with the top event at the root, intermediate events connected by logic gates (AND, OR), and basic events at the leaves; (2) the deductive direction from failure to causes; (3) qualitative minimal-cut-set extraction and, optionally, quantitative probability computation. It persists through safety and reliability standards (e.g. IEC 61025, MIL-HDBK-338), engineering documentation practices, and risk-assessment frameworks. [formal: fault tree analysis | substrate: behavior | horizon: hours | explicit: yes | epoch: 0.47]
Accepted ontology entry
fault-tree-analysis
Fault-tree-analysis is a human-made analytical method for systematically deducing the combinations of component failures and events that can cause a specified top-level system failure. It is carved by: (1) a boolean logic tree structure wi…
Definition
Why it is in scope
A human-made analytical methodology that uses a deductive, top-down graphical technique to identify potential causes of system failure. Built to persist through safety standards, engineering documentation, and reliability-assessment practice.
Names and aliases
- fault-tree-analysisen · CANONICAL
Relations from this entry
- cms88c18w000h73fkh1a5pwxvSERVES →
Fault-tree-analysis is a deductive analytical method whose designed purpose is to support reliability-engineering by identifying failure modes and their combinations. Law 8d SERVES: the servant (fault-tree-analysis, the method) points at the master (reliability-engineering, the discipline it serves). The removal test: remove reliability-engineering as the practice, and fault-tree-analysis still operates — so it is not DEPENDS_ON. It is not INSTANCE_OF either: a method is not a discipline.
- cms8624hw0106h6s8t8c71gedSERVES →
Fault-tree-analysis is performed for the sake of corrective-action: its deductive top-down analysis of failure modes and root causes produces the diagnostic output that corrective-action needs to identify what must be fixed and why. SERVES per Law 8d: the servant (FTA) points at the master (corrective-action).
- cms83ire500qfh6s8aeqyay3jDERIVED_FROM →
The fault-tree graphical technique (a top-down boolean diagram of failure combinations) existed first and fed into the formalized methodology of fault-tree-analysis. Historical precedence: the technique was developed at Bell Labs in 1962, and the methodology grew from it.
- cms883nr100351c4rlyyeywusINSTANCE_OF →
fault-tree-analysis IS a specific kind of hazard-analysis: it applies Boolean logic to model how component failures combine to produce system-level hazards. A competent speaker would call a fault-tree analysis 'a kind of hazard analysis.'
- cms8a929t007573fkafm8ap7iSERVES →
Fault tree analysis is built and maintained for the sake of risk management: it provides a systematic, deductive technique for identifying root causes of system-level failures, mapping failure paths with Boolean logic — the structured output directly feeds risk assessment and treatment processes. Per Law 8d: for whose sake? fault-tree-analysis serves risk-management.
- cms81mqtv00jeh6s8s7t3j6hyINSTANCE_OF →
Fault tree analysis IS a specific kind of risk assessment method — it uses deductive logic to map failure paths and identify root causes of system-level failures. A competent speaker would call it 'a type of risk assessment.' Nearest kind: risk-assessment.
- cms8fls9600pv73fklpt543o4INSTANCE_OF →
fault-tree-analysis IS a specific kind of cause-analysis. It systematically traces system failures backward through logical gates to identify fundamental causes. Per Law 9: specific→general.
- cms7wyk72004ph6s8d82lhwqlSERVES →
Fault tree analysis is designed and maintained for the sake of reliability — its entire purpose is to identify failure paths, quantify unavailability, and guide design improvements that make systems more reliable. Law 8d: servant (fault tree analysis) → master (reliability). Remove reliability as a goal and fault tree analysis loses its reason for being.
- cms88c18w000h73fkh1a5pwxvINSTANCE_OF →
A fault tree analysis is a specific kind of reliability-engineering practice — a systematic, top-down method for analyzing system failures. A competent speaker would describe FTA as 'a reliability-engineering technique.' The direction is specific→general (Law 9).
- cmsiwqe7n01dtnobpyucv541rINSTANCE_OF →
A fault-tree analysis IS a specific kind of failure analysis — a top-down, deductive method for identifying combinations of component failures that lead to a system-level failure. A competent speaker would call it 'a type of failure analysis.' Direction: specific→general. Nearest kind: failure-analysis (Law 9, Law 11e).
Relations to this entry
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Record identity
- Created
- Jul 31, 2026, 1:28 AM UTC
- Content hash
- 263670fd5a986d32bd9a94f3fc17236b3a34674fae1cfc6d88d64d48737ce825