- Engineering principles, bio-mechanics, and trees
- Safety factors and strength-loss
- What does sonic tomography tell you about breaking safety
- How useful and how bad is drilling?
- The Static Load Test
- The component parts of likelihood of failure
- VALID Tree Risk-Benefit Assessment
- Field exercises – Significance of decay assessment
- Field exercises – Likelihood of Failure calibration exercises
“David Evans provided a masterclass on how to deliver an engaging presentation with unique content…. It was the last talk, so those who left early really missed out”
Jeremy Barrell – Barrell Tree Consultancy, UK
"VALID has changed the way I look at tree risk assessment."
Jeff Opar - ISA Tree Academy Workshop, Fort Worth
About the Speakers
Frank Rinn studied Physics at Glassen and Heidelberg University. After completing his master thesis, Frank developed the method of needle resistance drilling and eventually started his own company, RINNTECH. Frank owns national and international patents and trademarks such as RESISTOGRAPH® and ARBOTOM®. Frank is an expert in inspecting trees and timber structures. He gives lectures and training and spends much of his time volunteering in the arboriculture industry world-wide and as the Executive Director of ISA Germany.
David Evans is the Director of VALID; a non-profit organisation delivering training and guidance in tree risk-benefit assessment and management. VALID is a ground-breaking approach to tree risk assessment which is a best of worlds, third way, that marries the benefits of both quantitative numbers and qualitative words. The VALID prototype was recently presented at the UK Arboricultural Association’s 50th conference, to considerable acclaim.
David has presented at many international conferences, and last year introduced the ‘Likelihood of Failure Club’ part of VALID to the sold-out Tree Academy Workshop as part of the ISA conference in Fort Worth. In February, he completed a 6-city tour of New Zealand and Australia, where he played Likelihood of Failure Club with more than 250 arborists.
Before he set up VALID, for more than a decade, David was one of the lead Quantified Tree Risk Assessment (QTRA) trainers, and an invaluable contributor to QTRA’s past development. He is currently dipping his toes back into the academic stream by undertaking a PhD into Tree Risk-Benefit Assessment.