The Bradley Curve, Safety Maturity

Most safety programmes fail because they’re sized for a culture that doesn’t exist yet. The Bradley Curve is the diagnostic that prevents that.

The model identifies four stages of safety maturity, and each stage requires a different set of interventions to move forward. Skipping a stage doesn’t accelerate progress, it produces a programme that the culture rejects.

Stage 1, Reactive. Safety is what happens after an incident. Compliance is treated as a tax. Workers see safety as the safety team’s job. Investment that works at this stage: clear rules, basic PPE, incident investigation, leadership visibility.

Stage 2, Dependent. Safety is enforced from above. Workers comply because they’re told to. The improvement curve is driven by supervision and consequences. Investment that works: structured procedures, supervisor training, observation programmes, recognition tied to compliance.

Stage 3, Independent. Workers take ownership of their own safety. Hazard recognition is internalised. The improvement curve is driven by personal accountability. Investment that works: behaviour-based safety, individual coaching, hazard recognition training, near-miss reporting culture.

Stage 4, Interdependent. Workers take ownership of each other’s safety. The team becomes the unit of accountability. Improvement is driven by peer engagement and collective learning. Investment that works: peer-to-peer observations, team-based incident learning, advanced safety leadership development.

The diagnostic value is in two questions: what stage are we actually in, and what investment matches that stage. Most programmes that fail are trying to install Stage 4 interventions in a Stage 2 culture. The interventions are good. The culture isn’t ready. The result is a great programme that nobody adopts.

I use this with safety leadership teams to size investment realistically and to sequence the journey honestly. It is, as far as I can tell, the most useful single model in safety transformation work.