Qualitative risk assessment

Category: Risk identification & assessment · Reviewed by Taylor Watts, Broker · New Business · Last reviewed

Qualitative risk assessment

Qualitative risk assessment describes risk in categorical or descriptive terms — high / medium / low, severe / moderate / minor — rather than in numerical probabilities and monetary impacts. It is the appropriate approach where data is too sparse to support quantitative modelling, where speed matters more than precision, or where the risk is fundamentally judgemental.

Strengths

• Quick to apply and accessible to non-specialists.
• Supports group consensus-building.
• Suitable for emerging risks where data is absent.
• Pragmatic for low-materiality risks that do not justify modelling effort.

Weaknesses

• Categories (“high”, “moderate”) have no agreed meaning across organisations.
• Ordinal scales cannot be summed, multiplied or aggregated without distortion.
• Vulnerable to anchoring, availability and groupthink biases.
• Produces decisions inconsistent with expected-loss reasoning when used naively.

Mitigating the weaknesses

• Anchor the categories to defined ranges (likelihood as a probability band, impact in £).
• Require named owners and rationales for each rating.
• Independent challenge by the second line.
• Periodic calibration against materialised losses.

References

• IEC 31010:2019.
• HSE INDG163.
• ISO 31000:2018.

Cross-references

• Quantitative risk assessment
• Semi-quantitative risk assessment
• Likelihood and impact scoring

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