Preliminary Hazard Analysis, PHA
Updated 2026-08-13
INTRODUCTION
English translation pending.
CORE DEFINITION
Preliminary Hazard Analysis is an early-stage technique that systematically identifies potential hazard sources, hazardous scenarios, and their consequences, then feeds safety constraints into subsequent design. Its core claim is that safety must be designed in rather than patched after the fact, because design freedom is greatest and change cost lowest at the concept stage, making early intervention far cheaper than later rework. The condition is that hazards be ranked by severity and probability rather than merely listed, so that trade-offs can be guided.
SCAFFOLDING EFFECT
Reduce cognitive load
- Design safety in: set safety constraints while design freedom is maximal instead of patching after the fact. - Rank before acting: grade hazards by severity and probability to guide trade-offs. - Feed constraints downstream: hand safety requirements to the design as inputs.
Anchor fast decisions
Identifying hazard sources and consequences at the earliest design stage, when change is cheapest, front-loads safety constraints and avoids late rework; the earlier the intervention, the larger the preventive return.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Hazard_analysisverified
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