Barrier Analysis
Definition
A method that identifies the physical, administrative, and procedural barriers that should have prevented harm, and asks which barriers were absent, inadequate, or defeated.
- Field
- Root-cause / incident analysis
- Focus
- Barriers meant to prevent harm
- Core question
- Which barrier was absent, inadequate, or defeated
- Barrier types examined
- Physical, administrative, procedural
Common questions
How does barrier analysis differ from simply asking what went wrong?+
Rather than tracing a single causal chain, it systematically inventories every safeguard that should have stood between a hazard and the harm, then evaluates each one individually. This structure catches situations where several weak barriers failed together, not just the last one that gave way.
What is a common pitfall when applying barrier analysis?+
Treating a barrier as adequate simply because it existed on paper, without checking whether it was actually functional, enforced, or reachable at the time of the incident. An administrative policy that nobody followed provides no real protection even though it appears in an audit as a barrier in place.
Related terms
- 5-Whys
- An iterative questioning technique that moves from a symptom to underlying causes by asking 'why?' repeatedly until a systemic explanation is reached.
- Fault Tree Analysis (FTA)
- A top-down, deductive Boolean logic model that works backward from a specific undesired top event through AND/OR gates to identify minimal cut...
- FMEA / FMECA
- Failure Mode and Effects Analysis is a bottom-up, inductive method listing what can fail in each component and the effect on the...
- Minimal Cut Set
- In a fault tree, the smallest set of simultaneously failing basic events that is sufficient to cause the top event. Identifies the...
- Root Cause
- The fundamental, underlying deficiency from which the failure originated. Distinguished from immediate cause (the final physical event) and contributing factors. Root-cause analysis...