National Diploma
The NEBOSH National Diploma is a Level 6 professional qualification. Its assessments test whether you can apply health and safety principles to complex, real workplaces, not simply recall definitions. This domain expects professional judgement: you must select and justify controls, interpret legal duties, and show how management systems turn policy into practice. Answers should use UK terminology and cite recognised frameworks such as HSG65 and COSHH, without inventing legal citations.
Core rules the examiner rewards
- Reasonably practicable is a risk-versus-sacrifice test: compare the risk with the time, cost and effort needed to control it. It is not a licence to do nothing, and it is not strict ALARP at any cost.
- Hierarchy of control: eliminate, substitute, engineering controls, administrative controls, then PPE. Justify why a lower-level control is not sufficient alone.
- Management system cycle: plan policy and arrangements; do implementation and risk control; check monitoring, inspection and audit; act on review and corrective action.
- Route-specific controls: match the control to inhalation, ingestion, skin contact, or physical hazard. A generic list scores poorly.
Worked example
A small workshop uses solvent degreasing. Operators report headaches, and an extraction hood has no maintenance record. Explain how exposure should be reduced.
Reasoning: first confirm the substance and exposure route; COSHH requires assessment, prevention, or adequate control. Apply elimination or substitution first (water-based cleaner or enclosed process). If solvent remains, use enclosure and local exhaust ventilation, maintain and test the LEV, add safe systems of work and training, then PPE as a last line. Consider DSEAR if the solvent is flammable, and health surveillance where appropriate. State that residual risk must be reduced so far as is reasonably practicable.
Traps that cost marks
- Confusing hazard and risk, or describing controls without linking them to the task and exposure route.
- Writing “PPE and training” as a complete answer when engineering controls are feasible.
- Treating ALARP as “as low as possible regardless of cost”, or ignoring cost-benefit reasoning.
- Giving generic management text with no workplace context.