What the third axis changes
Fine-Kinney builds risk as the product of three variables: probability, frequency of exposure, and severity of outcome. Making exposure its own axis separates two hazards that a two-axis arrangement would drop into the same cell.
Where it is preferred
Where duration is decisive: working a full shift on a noisy line is not the same as a few minutes of chemical exposure a day. In production, maintenance and field work this distinction usually changes the decision.
What to watch
The product of three factors spans a wide numeric range; band boundaries are read from the method's own definition and are not loosened to suit a workplace. Shifting a band shows the same hazard with a different urgency a year later and breaks comparability.
In Optifora
The risk assessment module takes all three axes separately, computes the band, and shows the same hazard's score from earlier assessments side by side. When the method changes, the old record is not deleted; which assessment used which method stays in the record.