Qualitative Risk Matrix

Qualitative risk matrices provide a pictorial way of determining levels of risk for each part of an ecosystem. A risk matrix is composed of two axes, which describe the overriding factors that would determine the likelihood of each species experiencing a pre-defined undesirable event. The most critical aspect of developing a qualitative risk matrix is choosing appropriate factors for the vertical and horizontal axes. Both the frequency and consequence of each accident scenario are then estimated on simple relative scales, such as Low-Medium-High. The risk for each scenario is the product of the frequency rating and consequence rating.
Reference: K.L. Astles , et al, An ecological method for qualitative risk assessment and its use in the management of fisheries in New South Wales, Australia , Fisheries Research 82 (2006) 290–303
Technical Tools/Risk Assessment/Semiquantitative Risk Analysis