Study for Working Safely by practising decisions, not recall. For every scenario you read, ask three questions: what is the hazard, how likely and how severe is the harm, and which control sits highest in the hierarchy? If you can answer all three with a justified order of action, you are revising the way scenario-based safety questions are actually framed.
Hazard and risk are two different judgements, not synonyms
A hazard is something with the potential to cause harm; a risk is the chance of that harm happening combined with how serious it would be. Confusing the two produces weak answers, so fix the distinction before anything else.
Test the distinction with concrete objects. A trailing cable, a vat of hot oil, and a forklift are hazards: each has inherent potential to injure. Risk only appears when you add context: the cable in a quiet corridor on a dry day carries a lower risk than the same cable across a busy entrance in the rain. Practice by taking any object and describing its hazard first, then its risk in one sentence that names both likelihood and severity.
Build a two-part vocabulary for risk statements. Likelihood covers how often people are exposed and how easily the event occurs; severity covers the worst credible outcome, from minor bruising to fatality. A risk assessment weighs both. When revising, never accept a one-word risk judgement such as "high" without being able to say whether it is high because exposure is frequent, because the outcome is severe, or both.
Ranking competing risks: a warehouse scenario where the obvious answer is wrong
When two hazards compete for attention, compare likelihood and severity side by side rather than reacting to which danger looks more dramatic. Ranking is a deliberate two-column judgement, not a gut reaction.
Scenario 1. A loading bay has an electric pallet-truck charging station with a visibly worn cable, and a loose floor tile at the doorway every staff member uses. A plausible mistake is to demand an immediate electrician and ignore the tile, because electricity feels more dangerous. The better decision treats these as two separate risk statements: the cable is low likelihood (only touched when moving the truck) but potentially severe; the tile is very high likelihood (every shift, every person) with moderate severity, since a trip at a doorway can still cause a fracture.
Why the ranking matters: the tile affects more people more often, so a same-day interim control such as marking, barring, or repairing the doorway is justified, while the cable can be isolated immediately by taking the charger out of use and then repaired. The teaching point is that severity alone never settles priority. In revision scenarios, always write both the likelihood case and the severity case before choosing what to do first, and check your interim control is proportionate and available.
The hierarchy of control: why the first answer is never "give them PPE"
The hierarchy of control orders measures from most to least effective: eliminate, reduce or substitute, isolate or engineer the danger, use safe systems of work, and only then rely on personal protective equipment.
The order exists because the top controls remove the danger for everyone without anyone having to remember anything, while PPE protects one person only if it is worn correctly, fits, and is maintained. In Working Safely-style questions, an answer that starts with gloves, goggles, or boots is usually the wrong order. Check every scenario for a chance to stop the task, swap the substance, or guard the machine before you consider equipment worn on the body.
Use the hierarchy as a checklist you recite in order, and notice how each rung differs from its neighbours. Elimination ends the activity or removes the source; substitution replaces it with something less harmful; engineering controls separate people from the hazard physically; procedures and training change how people behave; PPE is the final shield. This distinction is the core of the comparison below and deserves its own rehearsal, because scenario answers are graded on whether controls sit at the right level.
- Eliminate: remove the hazard entirely, for example not doing the task at height at all.
- Substitute/reduce: replace a hazardous substance or method with a safer one.
- Engineer/isolate: guard machinery, enclose a process, or separate people from the danger.
- Administrative: safe procedures, training, signage, supervision, and job rotation.
- PPE: helmets, gloves, eye protection, footwear — last, not first.
| Control level | What it changes | Typical example | Main limitation |
|---|---|---|---|
| Eliminate | Removes the hazard source | Deliver goods by chute instead of carrying them upstairs | Not always feasible |
| Reduce/substitute | Lowers the danger of the source | Water-based paint instead of solvent-based | Substitute must genuinely be safer |
| Engineer/isolate | Separates people from the hazard | Machine guard, extraction unit, barrier | Needs maintenance to stay effective |
| Administrative | Changes human behaviour | Written procedure, permit to work, training | Relies on people following it |
| PPE | Shields the individual | Goggles, gloves, hearing protection | Protects one person; depends on correct use |
Scenario 2: manual handling where the tempting answer sits at the bottom of the hierarchy
Manual handling questions test whether you look upstream of the lift itself. The hazard families to recognise include manual handling, slips and trips, working at height, electricity, machinery, chemicals, and fire.
Scenario 2. Stock arrives at a shop and two staff carry heavy boxes up a staircase to the storeroom several times a week; one has recently complained of back pain. A common mistake is to answer "provide back-support belts and tell them to lift correctly" — a PPE-and-training response that leaves the load, the staircase, and the frequency untouched. The better decision climbs the hierarchy: could deliveries be scheduled to a level entrance, could a hand trolley or mechanical aid move the boxes, could heavy stock be stored downstairs, and could the load be split into smaller units?
Only after those options are exhausted do procedures and PPE enter: a two-person rule, marked safe weight guidance, and suitable footwear. This matters because the same reasoning transfers to every hazard family. For work at height ask whether the work can be done from the ground first; for chemicals ask whether a less harmful product exists; for electricity ask whether equipment can be isolated before anyone works near it. Train yourself to name at least one control at each level for any hazard you revise, and you will never be stranded offering only PPE.
Reading safety signs: what each colour and shape is instructing you to do
Safety signs follow a colour-and-shape code: red prohibits, yellow warns, blue makes something mandatory, and green marks safe conditions such as exits and first aid. Learning the code covers signs you have never seen before.
Work the code from shape outward. A red circle with a diagonal bar means a prohibited action — no entry, no smoking, do not extinguish with water. A yellow triangle warns of a hazard: slippery floor, overhead load, laser radiation. A blue circle states something you must do: eye protection must be worn, a specific route must be followed. A green rectangle or square points to safe conditions: emergency exits, assembly points, first aid equipment.
The revision habit is to decode, not memorise. When you meet a sign in a course scenario, name the colour class first, then infer the instruction, then check it against the picture. Also notice how signs interact with the hierarchy: prohibition and mandatory signs are administrative controls, and they only work if people understand them — which is itself the argument for learning the code rather than individual signs. Supplementary text below a sign sharpens the message, so practise reading sign plus text as a single instruction.
Reporting incidents and near misses: definitions and why near misses carry information
An incident is an event that caused actual harm or loss; a near miss is an event that could have caused harm but did not on this occasion. Both are reportable within a good safety culture, and near misses are early warnings.
Keep the definitions crisp: harm occurred or not. A pallet that falls from a racking and dents nothing is a near miss; the same pallet striking a person is an accident with injury. The reason near-miss reporting matters is that each one is free evidence of an uncontrolled risk before anyone pays for it. A scenario answer that dismisses a near miss because "no one was hurt" misses this point entirely.
Reporting connects to responsibilities. Everyone at work has a duty to take reasonable care of themselves and others, to follow safe systems, and to report hazards, incidents, and near misses through the established procedure so something can be done. Managers and employers carry broader duties to provide safe premises, equipment, information, and training. In revision scenarios, when you see a hazard that has clearly existed for a while, ask who knew, whether it was reported, and what the reporting route was — that chain is often the difference between an adequate answer and a complete one.
A walkthrough exercise, a self-check rubric, and an adaptable preparation sequence
Convert knowledge into decisions with a structured walkthrough of any workplace you can observe, then score yourself against a rubric. Finish with readiness checks so you know what remains to revise.
Exercise: choose a kitchen, garage, office, or shop you can walk through safely, and spend fifteen minutes recording five hazards. For each one, write a hazard statement, a risk statement naming likelihood and severity, and one control at three different hierarchy levels. Expected observations: slips and trips from cords or wet floors, manual handling from storage arrangement, electricity from damaged equipment, chemicals under the sink, and fire exits obstructed by stock. If you found only one or two hazards, repeat the walk looking specifically at each hazard family from this guide.
Self-check rubric, scored as learning milestones rather than predictions. Award one point for each of the five hazards correctly described as a hazard rather than a risk (5 points); one point for each risk statement that names both likelihood and severity (5 points); one point for each of the five hazards where your first proposed control sits at the top two hierarchy levels (5 points); one point for each of five safety signs correctly classified by colour code (5 points); and one point for correctly labelling a real observed event as an accident or a near miss (1 point). The maximum is 21 points. Sequence your preparation: first week, definitions and sign code; second week, hierarchy of control applied to each hazard family; third week, timed walkthrough scenarios plus the rubric until your score stabilises. Ready when: you can rank three competing risks with a reasoned order, and place any proposed control at its correct level without notes. Administrative details of the course and assessment are set by IOSH; check iosh.com for current arrangements rather than relying on second-hand summaries.
References and further reading
Use these references to explore the concepts and check the latest information from the relevant organizations.