Quantitative vs Qualitative Risk Assessment: What’s The Difference?

There are two types of common risk assessments, namely quantitative risk assessment and qualitative risk assessment. Both approaches are used to identify and manage risks in the workplace. However, their data requirements and assessment methods differ from one another. Organizations can choose the most suitable assessment for their needs by understanding the strengths and the differences of these two methods.

What Is Quantitative Risk Assessment?
Quantitative risk assessment checks numerical data to evaluate the potential risks. From quantitative risk assessment, businesses can calculate the occurrence probability and impact severity of the workplace hazards. It uses statistical analysis and mathematical calculations to provide objective results.

Typical Quantitative Risk Assessment Includes:
Hazard Identification: First, professionals will identify potential risks in the workplace by considering what hazards can occur.
Frequency Analysis: Based on previous records and predictive modeling, how often the potential risk can happen is determined.
Consequence Analysis: Next, the severity of consequences is calculated. It may include blast radius or spread of toxic gas.
Risk Calculation: Based on frequency analysis and consequence analysis, professionals calculate the total risk.
Risk Evaluation: Then, the results are compared against risk criteria to support data-driven decisions.

One main benefit of quantitative risk assessment is that it supports making data-driven decisions. As it uses measurable data and previous records, businesses can make more accurate decisions.

What Is Qualitative Risk Assessment?
Qualitative risk assessment identifies and manages risks based on human perspective, professional experience, and established criteria. Instead of providing exact figures, it gives scales like high, medium, or low. The results are usually presented in a list of risks alongside their likelihood levels and impacts.

Qualitative risk assessments are commonly conducted during the project planning stage to identify risks early. This allows organizations to decide whether the opportunities and risks are balanced.

Typically, professionals identify potential hazards in the workplace first. Then, the likelihood and impact of the hazards are estimated subjectively. The results are then plotted on a risk map to find out the areas that need immediate attention.

One major advantage of qualitative risk assessment is that it can be used to evaluate emerging risks with no previous records. Since it is flexible, organizations can use this approach to identify risks which are difficult to measure in numbers.

Quantitative And Qualitative Risk Assessment Comparison
Both quantitative and qualitative risk assessments have their own unique approach and process, being appropriate for different situations. Organizations should choose the risk assessment method based on their strengths to get effective results.

Data Dependency
Quantitative risk assessment derives results from previous data records and numerical statistics. Hence, organizations require sufficient recorded information to get accurate results.
On the other hand, the results of qualitative risk assessment are based on professional experience and operational knowledge.

Time And Resources Requirement