Which type of tree risk assessment uses ratings combined in a matrix to evaluate risk?

Which type of tree risk assessment uses ratings combined in a matrix to evaluate risk?

• A. Descriptive risk assessment
• B. Semi-quantitative risk assessment
• C. Quantitative tree risk assessment
• D. Qualitative tree risk assessment

Answer: (D)

Evaluating risk with a matrix based on descriptive categories is a qualitative approach. In this method you assign broad, non-numeric descriptors (like low, medium, high) to factors such as likelihood of failure and potential consequence. Those qualitative ratings are then mapped on a risk matrix to yield an overall risk level (for example, low, moderate, or high). The matrix provides a quick, visual way to combine categories and compare risks across trees or situations without relying on precise numbers. Semi-quantitative and quantitative methods, by contrast, introduce numeric scoring or actual measurements to produce a numeric risk value, rather than a purely descriptive category. So the use of qualitative ratings together with a matrix to determine a categorical risk outcome is the hallmark of a qualitative tree risk assessment.

Evaluating risk with a matrix based on descriptive categories is a qualitative approach. In this method you assign broad, non-numeric descriptors (like low, medium, high) to factors such as likelihood of failure and potential consequence. Those qualitative ratings are then mapped on a risk matrix to yield an overall risk level (for example, low, moderate, or high). The matrix provides a quick, visual way to combine categories and compare risks across trees or situations without relying on precise numbers.

Semi-quantitative and quantitative methods, by contrast, introduce numeric scoring or actual measurements to produce a numeric risk value, rather than a purely descriptive category. So the use of qualitative ratings together with a matrix to determine a categorical risk outcome is the hallmark of a qualitative tree risk assessment.