A task description tells you what should happen. Watching and discussing the job helps you see what could change, where someone could be exposed and which controls matter in practice.
Start with the conditions
Before work begins, look at the area and ask the people doing the task what has changed. Nearby activities, weather, access, equipment condition, materials and time pressure can all alter the risk picture.
Break the work into steps. For each one ask: what could cause harm, who could be exposed, how could exposure occur, and what would prevent or limit it? Pay attention to energy sources and interfaces between people, equipment and surroundings.
Look for exposure paths
Be specific about how a person could encounter the hazard: caught between moving parts, struck by a falling object, exposed to a substance or affected by an uncontrolled release of energy. Walk the route the job will take. Check line of fire, access and egress, stored energy, lifting paths, vehicle movements and simultaneous operations.
Use operators’ and maintainers’ knowledge. They often notice subtle changes that a form cannot capture.
Choose controls that work in the field
Consider whether the hazard can be eliminated first. If not, look for substitution, isolation or engineering controls. Administrative steps and personal protective equipment can help, but depend more on people noticing and acting correctly each time.
Agree who will put each control in place, how it will be checked and what should happen if a condition changes. A control that exists only on paper may not protect the crew.
Keep the assessment alive
Revisit the assessment when the job, conditions, equipment or crew changes, and whenever a control is missing or ineffective. Encourage people to pause work when the plan no longer fits what they see.
Use the free pre-task review sheet as a conversation prompt. Adapt it to your site and the work being planned.
Safety note: General educational material, not a substitute for legal requirements, site procedures or competent professional advice.