Module 1: Introduction to tree risk assessment
questions with verified answers
Breach of duty Ans✓✓✓ failure to act reasonable under the
circumstances described above
Conflicts Ans✓✓✓ e.g., sidewalk lifting, power lines, signage
impedance
Duty of care Ans✓✓✓ tree owner has some responsibility to provide a
reasonable degree of safety for people or property near trees in their
care
Failure Ans✓✓✓ breakage of a stem, branch, roots, or loss of
mechanical support
Failures Ans✓✓✓ stress due to external forces acting on the tree
exceed the strength of the tree structure of the tree-soil connection
supporting the tree
Likelihood Ans✓✓✓ (1) chance of full or partial failure (2) chance of
impacting a target (3) combined likelihood of failed part impacting a
target
Negligence Ans✓✓✓ failure to provide reasonable care, resulting in
property damage or injury
questions with verified answers
Breach of duty Ans✓✓✓ failure to act reasonable under the
circumstances described above
Conflicts Ans✓✓✓ e.g., sidewalk lifting, power lines, signage
impedance
Duty of care Ans✓✓✓ tree owner has some responsibility to provide a
reasonable degree of safety for people or property near trees in their
care
Failure Ans✓✓✓ breakage of a stem, branch, roots, or loss of
mechanical support
Failures Ans✓✓✓ stress due to external forces acting on the tree
exceed the strength of the tree structure of the tree-soil connection
supporting the tree
Likelihood Ans✓✓✓ (1) chance of full or partial failure (2) chance of
impacting a target (3) combined likelihood of failed part impacting a
target
Negligence Ans✓✓✓ failure to provide reasonable care, resulting in
property damage or injury
