Quantitative Risk Assessment (QRA) is a systematic method of combining historical data, scientific and engineering knowledge and expert judgement for quantifying risk of potential loss from unwanted event. It provides a rational basis for evaluating process safety with respect to its theoretical and practical limitations. Land use planning and Facilities Siting studies use QRA techniques to look at specific issues associated with the location and overpressure protection of buildings and other facilities. Benchmark consultants help clients through this robust analysis tool for risk management and safety improvement.