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If you go on the QTRA website, you can have a read of the practice notes, I think they are available for the public...might give you some more insight to this system. I have to say though it became more understandable and logical during the actual course and fieldwork.

Thanks Guy.

Wonder how similar the two courses are?

Yeah, I can understand that. I'm not totally sold just yet. The section dealing with Probability of Failure is the area where personal knowledge of the trees you deal with comes into it, your understanding of how they grow, how they fail, what defects they can manage, how they respond to...

TRAQ was mentioned and is seen as a more risk based approach...hey, any kind of mechanism to give people a better idea about how much ACTUAL risk they face from trees is good. Counter move to 'Arborphobia' that kicks in any time a twig bounces off a car... It was expensive, but at least its tax...

Just did the QTRA (Qualitative Tree Risk Assessment ) course over the last two days...anybody else done it? It's going to take me a while to absorb it all...certainly give you a new perspective to assessing and quantifying the risk of harm...when the outcomes result in risk of harm as 1/100,000...