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Qualitative versus quantitative risk analysis
Short answer
Qualitative analysis subjectively prioritizes risks using a probability-impact matrix, quick and done on all projects. Quantitative analysis uses numerical techniques like EMV, decision trees, and Monte Carlo to estimate objective probabilities and cost/time reserves, applied to top risks after qualitative analysis and requiring reliable data.
Differentiate qualitative and quantitative risk analysis process.
Qualitative risk analysis prioritises risks for further analysis or action by assessing and combining their probability of occurrence and impact, using subjective ratings. Quantitative risk analysis numerically analyses the effect of identified risks on the overall project objectives using numbers (money, time).
| Basis | Qualitative analysis | Quantitative analysis |
|---|---|---|
| Nature | Subjective, descriptive | Objective, numerical |
| Output | Priority ranking (high, medium, low) | Probability of meeting cost/time goals, expected values |
| Data needed | Expert opinion, little data | Reliable data, estimates, models |
| Time and cost | Fast and cheap | Slower, costly |
| Done | Always, for every project | When needed: large or high-risk projects |
| Sequence | First | After qualitative |
| Scale | Very low to very high | Rs, days, percentage |
| Tools | Probability-impact matrix, risk categorisation, risk urgency assessment, expert judgment | Sensitivity analysis, expected monetary value (EMV), decision tree, Monte Carlo simulation |
| Output example | "Vendor delay: high priority" | "EMV of vendor delay = Rs 2 lakh; 70% chance to finish within 12 months" |
Probability-impact matrix (qualitative)
Prob.
High | M | H | H
Med | L | M | H
Low | L | L | M
Low Med High Impact
EMV example (quantitative)
Risk: server failure with probability 0.2 and cost Rs 5,00,000. EMV = 0.2 × 5,00,000 = Rs 1,00,000.
Relation
Qualitative analysis filters the many risks into a short list; quantitative analysis is applied on top-priority risks to estimate contingency reserves and decide responses.
Example: In an ERP project, qualitative rating marks "data migration errors" as high; quantitative analysis estimates the expected delay at 3 weeks and cost at Rs 4 lakh to set the reserve.
✓ Answer checked by Claude Opus 5.5 (high effort)
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