RT Journal Article SR Electronic T1 Quantified Tree Risk Assessment Used in the Management of Amenity Trees JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 57 OP 65 DO 10.48044/jauf.2005.007 VO 31 IS 2 A1 Ellison, Michael J. YR 2005 UL http://auf.isa-arbor.com/content/31/2/57.abstract AB A system of tree risk assessment is proposed that expands concepts developed by others and enables a probability of significant harm to be applied to tree failure risk. By evaluating the components of a tree failure hazard and assigning to them estimates of probability, the proposed system enables the skilled tree inspector to calculate the product of those probabilities to produce a numerical estimate of risk. The use of quantification in the assessment of tree hazards enables property owners and managers to operate, as far as is reasonably practicable, to a predetermined limit of reasonable or acceptable risk.