Which of the following is an example of a qualitative risk assessment approach?

The Delphi method gathering expert opinions is a classic example of a qualitative risk assessment approach. This technique relies on the insights and judgments of experts in a particular field to identify and evaluate risks. It typically involves multiple rounds of questioning, where experts provide their views anonymously, followed by a summary of the responses and subsequent rounds of discussion. The iterative nature of this method helps to refine understanding and consensus around potential risks without the need for numerical data.

Qualitative assessments focus on the characteristics of risks, such as their likelihood and potential impact, rather than on quantifiable data or statistical modeling. This method is particularly useful in situations where numerical data may be scarce or where expert knowledge can shed light on complex or poorly understood risks.

In contrast, the other options pertain to approaches that involve quantitative analysis and measurements—such as statistical evaluations, modeling based on numerical inputs, or direct measurements of chemical concentrations—all of which are characteristics of quantitative risk assessment methods.