A Minimum Industry Standard for Tree Risk Assessment
This standard covers the core standards of tree risk assessment for arborists in Australia and New Zealand. It is not a tree risk assessment system. Rather, the document provides a framework within which different systems for tree risk assessment may be applied.
About the MIS Series
This book is one in a series of Minimum Industry Standards (MIS) produced by Arboriculture Australia Ltd and the New Zealand Arboricultural Association in consultation with the national arboriculture community in both countries. These industry peer-reviewed documents provide a ‘body of knowledge’ which is shared by practitioners and can be used as the basis for training, dissemination of skills and professional development.
MIS501 – Tree Risk Assessment (Member Price)
1: Introduction to tree risk assessment
- 1.1: What is risk?
- 1.1.1: Context of tree risk
- 1.1.2: Applying tree risk assessments
1.2: Tree risk terminology
- 1.2.1: Risk factors
- 1.2.2: Probability and likelihood
1.3: Risk thresholds
- 1.3.1: Baseline risks of trees and risk thresholds
2: Risk assessment methodologies
- 2.1: Quantitative tree risk assessment
- 2.2: Qualitative tree risk assessment
- 2.3: Comparative tree risk assessment
3: Components of tree risk assessment
3.1: Target assessment
- 3.1.1: Types of target
- 3.1.2: The target zone
- 3.1.3: Target occupancy
- 3.1.4: Specifying targets
- 3.1.5: Specifying the target zone
- 3.1.6: Multiple probable targets
3.2: Tree failure assessment
- 3.2.1: Factors for risk assessment
- 3.2.2: The likelihood of failure
- 3.2.3: Trees with multiple factors
- 3.2.4: Cognitive biases affecting assessment of likelihood
3.3: Impact assessment
- 3.3.1: Likelihood of impact
- 3.3.2: Likely consequence
- 3.3.3: Range of consequences
4: Tree risk assessment professional requirements
- 4.1: Context of assessment
- 4.1.1: Limits of assessment
- 4.1.2: Levels of tree assessment
- Level 1 (limited visual) assessment
- Level 2 (visual) assessment
- Level 3 (advanced) assessment
4.2: Providing advice on risk
- 4.2.1: Benchmarking risk
- 4.2.2: Providing advice on risk controls (mitigation)
- 4.2.3: Determining and communicating residual risk
- 4.2.4: Value and benefit(s) of the tree(s)
- 4.2.5: Priority and timeframe for implementing control measures
- 4.2.6: Recommending other works
- 4.2.7: Reinspection of tree
- 4.2.8: Auditing of controls
4.3: Competency to perform tree risk assessment
- 4.3.1: Benchmarking and auditing assessments of risk
- 4.3.2: Maintaining industry currency