Question 1 of 7: Safety Engineering, Accident Theory, and Prevention Approaches

Question 1: Safety Engineering, Accident Theory, and Prevention Approaches (20 marks: 6/7/7)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

(i) Safety Engineering versus Safety Practice

• Safety engineering — applying engineering principles so hazards are designed out or controlled at source (hazard analysis, risk assessment, guarding, ventilation, fail-safe design); proactive and technical.
• Safety practice — the day-to-day management/administrative activities that maintain safe operations (training, procedures, inspections, permits, PPE, incident reporting, enforcement, culture); operational and behavioural.
• Engineering builds safety in; practice sustains it. Both are essential.

(ii) Multiple-Factor Theory (diagram)

        MAN (human)          MACHINE (equipment)
        - fatigue, error     - poor guarding, defect
              \                    /
               +----> ACCIDENT <--+
              /                    \
      MEDIA (environment)     MANAGEMENT (system)
      - noise, housekeeping   - training, procedures

Accidents arise from the convergence of several contributing factors (the 4 M's); removing any one may prevent the accident.

(iii) Reactive versus Proactive Prevention

(a) Reactive: Accident → Investigate → Find cause → Corrective action → Prevent recurrence — learns from events that already caused harm.

(b) Proactive: Hazard identification → Risk assessment → Controls → Monitor/audit → Accident avoided — prevents the first injury. A mature program uses proactive as the primary defence and reactive to close remaining gaps.