.........Quantified Tree Risk
.......Assessment System (QTRA)

Applying established and accepted principles of risk management, QTRA provides a robust framework for the assessment of the three components of tree-failure risk – Target Value, Impact Potential and Probability of Failure. By first assessing the value or usage of targets upon which trees might fail, tree owners and site managers can establish to what degree of rigour tree inspections are required.

By assessing the probabilities of the components and calculating their product, it is possible for the skilled tree assessor to quantify the risk of significant harm from tree failure in a way that enables owners and managers to balance safety with tree values and operate to a predetermined limit of reasonable or acceptable risk.

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