Hierarchy of Controls: Residual Risk Simulator

Hierarchy of Controls

EliminationRemove the hazard source entirely

SubstitutionSwap in a less hazardous process

Engineering barrier 40%

Admin / training level 30%

PPE effectiveness 50%

Base severity 3

Live Readouts

Likelihood (eff.)

—

Severity (eff.)

—

Residual risk score

—

Risk level

—

Exposures blocked

Exposures reached

How it works

The hierarchy of controls ranks interventions by how directly they act on a hazard, from most to least effective. This model turns that ranking into one governing equation:

Risk = Likelihood_eff x Severity_eff

Likelihood_eff = 0                          if Elimination is on
Likelihood_eff = L0 x (1 - subFactor)
                    x (1 - engFactor)
                    x (1 - adminFactor)     otherwise

Severity_eff = Sev0 x (1 - ppeFactor)

Elimination — removes the hazard source outright; the emitter goes dark and Likelihood_eff drops to zero regardless of every other slider.
Substitution — swaps in a less hazardous process, cutting the emission rate by a fixed factor before any downstream control acts.
Engineering barrier — a physical guard between the hazard and the workforce; each particle crossing the barrier plane is stopped with probability equal to the slider.
Admin / training — procedures and awareness reduce the chance a worker is in the exposure path when a particle arrives, acting on likelihood like the barrier does.
PPE — the last line of defense: it does not stop exposure, it reduces the severity of harm once exposure happens, so it only scales Severity_eff.

The residual risk score (0–25, a 5x5 likelihood-by-severity matrix) is read out live and classified Low / Medium / High / Critical, exactly as an OSHA-style risk matrix would grade a workplace hazard after controls are applied.

Hazard flux Engineering barrier Workforce

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