Tree Wise Men

Tree Risk Assessment

Posted in: Blog

August 4, 2014

Peter Castor, Director at Tree Wise Men® Australia Pty Ltd has recently undertaken training and attained certification in two tree risk assessment methods: Quantified Tree Risk Assessment (QTRA) and Tree Risk Assessment Qualification (TRAQ).

QTRA is a risk assessment tool developed by Mike Ellison in the UK which “quantifies the risk of significant harm from tree failure in a way that enables tree managers to balance safety with tree values and operate to predetermined limits of tolerable or acceptable risk” (

TRAQ is an alternative risk assessment tool developed by the International Society of Arboriculture (ISA) which “promotes the safety of people and property by providing a standardised and systematic process for assessing tree risk” (

Tree risk assessment quantifies the risk of harm (persons) or damage (structures) relating to tree or branch failures, with particular focus on occupancy rates within a fall zone.  Tree risk assessment is an important part of best practice urban forest management.  It is particularly valuable in the context of large scale public and private spaces, such as schools, hospitals, parklands and residential developments.

Contact Tree Wise Men® Australia Pty Ltd to discuss your tree risk assessment needs.

Tree Risk Assessment