ABSTRACT
A full appreciation of the hazards of a particular workplace is often achieved only if a complete risk assessment is undertaken with the involvement of all parties concerned. Control involves the application of technological, engineering and operational measures directed at the health hazard, work environments or workers to eliminate any adverse outcomes or reduce risk to acceptable levels. Eliminating a given hazard from the workplace by completely removing a process or a substance is the definitive way to reduce risk. In some industrial processes, where substitution of a less hazardous material is possible, the risk associated with handling hazardous materials can be reduced by a change in the process. The complete enclosure of a hazard is usually restricted to the extreme cases where escape of the hazardous substance could have serious health consequences or may be immediately life-threatening. The exposure controls examined so far work by eliminating or substituting the material or process, or by engineering out the risk.
