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Training - QTRA - The Quantified Tree Risk Assessment (QTRA) system applies established and accepted risk management principles to tree safety management. Training - VTA - A Practitioners Guide to Visual Tree Assessment centres on the concept that to understand tree stability and the effects of defects and decay, we must have an understanding of how decay and defects follow growth patterns. The training takes you through the process of visual tree assessment, assessing tree stability and decay mapping using the Thor 710 Nylon Hammer and visual signs and symptoms.