Hierarchy of control measures diagram, developed by Safe Work Australia.

'Level of health and safety protection' is represented by a vertical scale, with 'Highest' at the top and 'Lowest' at the bottom.

'Reliability of control measures' is represented by a vertical scale with 'Most' at the top and 'Least' at the bottom.

Level 1 (top of diagram) - Eliminate the hazards

Level 2 (middle of diagram) - Substitute the hazard with something safer Isolate the hazard from people, Reduce the risks through engineering controls

Level 3 (bottom of diagram) - Reduce exposure to the hazard using administrative actions, Use personal protective equipment