Module 7.) Data Analysis and Risk Categorization

Question 1

The degree or amount of risk that the owner, manager, or controlling authority is willing to accept.

Answer 1

Acceptable Risk

Question 2

A tool for categorizing the combined likelihood of a failure impacting a target.

Answer 2

Likelihood Matrix

Question 3

A rectangular array of rows and columns used to facilitate problem solving or decision making.

Answer 3

Matrix

Question 4

The concept that any tree, part, or failure mode could represent more than one type of risk.

Answer 4

Multiple Risks

Question 5

The process of assigning risk and risk factors to categories based on the severity or hierarchy.

Answer 5

Risk Categorization

Question 6

The process of comparing the assessed risk against given risk criteria to determine the significance of the risk

Answer 6

Risk Evaluation

Question 7

A tool for ranking and displaying risks by assigning ratings for consequences and likelihood.

Answer 7

Risk rating matrix

Question 8

The subjective perceived level of risk from a situation or object, often differing from the actual level of risk.

Answer 8

Risk Perception

Question 9

Degree of risk that is acceptable to the owner, manager, or controlling authority.

Answer 9

Risk Tolerance

Question 10

Time period for which an assessment is defined

Answer 10

Time Frame.

Question 11

T - F When more than one defect or condition is present in a tree, the defects should be considered alone and in combination with other conditions

Answer 11

True

Question 12

T-F When there are multiple levels of risk within a tree, identify the failure mode having the greatest risk and report that as the overall risk rating.

Answer 12

true

Question 13

T-F How people perceive risk and their need for personal safety is inherently subjective; therefore, risk tolerance and acceptable risk thresholds vary among tree owners/ managers.

Answer 13

True

Question 14

Combine the likelihood of failure and impact with the expected consequences of failure to determine a risk rating using the ____ _____ ___ ______

Answer 14

Risk rating matrix

Question 15

Likelihood of failure

Answer 15

Imminent,
Probable,
Possible,
Improbable,

Question 16

Likelihood of Impact

Answer 16

High,
Medium,
Low,
Very low.

Question 17

Likelihood of failure and impact

Answer 17

Very likely,
Likely,
Somewhat likely,
unlikely.

Question 18

Consequences of failure

Answer 18

Severe,
Significant,
Minor,
Negligible.

Question 19

Risk Rating

Answer 19

Extreme,
High,
Moderate,
Low

Question 20

T-F When more than one defect or condition is present in a tree, the defects should be considered alone and in combination with other conditions.

Answer 20

True

Question 21

T - F When there are multiple levels of risk within a tree, identify the failure mode having the greatest risk and report that as the overall risk rating.

Answer 21

True

Question 22

T - F How people perceive risk and their need for personal safety is inherently subjective; therefore, risk tolerance and acceptable risk thresholds vary among tree owners/managers.

Answer 22

True

Question 23

If the risk rating of a whole-tree failure is rated as low, and the risk rating of a branch failure is rated as high, what is the tree's overall risk rating?
A.) Low,
B.) Moderate,
C.) High,
D.) Extreme

Answer 23

C.
Various risk posed by a tree cannot be added using matrix methodology, instead, the tree assessors should identify-among all the failure modes and consequences assessed-the greatest risk and report that as the tree risk rating. in this example, the greatest risk is the branch failure that is rated as high, so the overall risk rating would be high

Question 24

A tree in which a failure has started or is most likely to occur in the near future, even if there is no significant wind or increased load, would be categorized with a likelihood of failure of
A,) Imminent,
B.) Probable,
C.) Possible,
D.) Improbable.

Answer 24

A.)
A tree with a failure that has already started has an Imminent likelihood of failure. Trees categorized with an imminent likelihood of failure may be infrequent, but require immediate action to protect people from harm.

Question 25

To estimate likelihood of impact, the arborist should attempt to determine.
A.) The occupancy rate of targets within the target zone
B.) factors that could affect the direction of the tree’s fall,
C.) Factors that could protect the target.
D.) All of the above.

Answer 25

D.)
Factors that affect the likelihood of impact include occupancy rate, direction of fall, protection factors, and location with the target zone.

Question 26

All of the following are the tree risk assessor’s responsibility in the risk evaluation process EXCEPT.
A.) Presenting the level of risk determined
B.) providing the mitigation options
C.) Describing the residual risk after mitigation.
D.Deciding which mitigation actions to take, If any

Answer 26

D.
Risk evaluation is the process of comparing the assessed risk against given risk criteria to determine the significance of the risk. The risk assessor presents the level of the risk that was determined, the recommend mitigation actions or options, and their associated residual risks, the tree owner or risk manager must then decide on what actions, if any, to take.