▪ O4: average response time of the control center ▪ O5: monthly upward trend (negative slope) All of this is already in the report B.Latent variables (L) – inferred from the system Here is the conceptual leap in the representation of the system state: ▪ L1: accumulated fatigue (proxy: monthly recurrence per operator) ▪ L2: operational pressure (proxy: months with higher event density) ▪ L3: reliability of the human-technical system (repetition despite pauses) ▪ L4: poor physiological adaptation to shift work (day/night) These variables are not explicit, but the system reveals them indirectly. C.Dynamic human factors (H) Based on cross-referencing the current system + HR: ▪ Percentage of operators with little experience in heavy tonnage ▪ Percentage of events concentrated in certain groups/contractors ▪ Operators who "pass the protocol" but raise another alarm days later ▪ real effectiveness of the active break (does it reduce recurrence or not?) D.Environmental and energy conditions (E) Derived from the aforementioned operational context: ▪ night driving ▪ Water on the track ▪ long ramps ▪ Mixed traffic (light vehicles + trucks) ▪ intersections ▪ presence of fog These conditions do not cause fatigue, but they amplify it energetically. 6.QPIFAT SIMULATION WITH OAS DATA “The numerical values presented are illustrative only and do not represent calibrated system thresholds.” The simulation considers the integration of variables from four main families: observable precursor variables, latent variables, dynamic human factors, and environmental and energy conditions, consistent with the conceptual framework described above. The observable precursor variables (O) were associated with the rate, severity, and recurrence of fatigue alerts, as well as the operational response times recorded by the system. The latent variables (L) represented the accumulation of fatigue over time, inferred from annual trends and recurrence patterns. Dynamic human factors (H) included differences in experience, shift rotation, and prolonged exposure, while environmental and energy conditions (E) 8
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