Build your Pareto analysis
Enter issue categories, counts, severity weights, and cost values. Choose the basis that matches the project decision you need to make.
Example data table
This sample project issue log shows how to structure inputs before generating the chart and ranking report.
| Category | Occurrences | Severity | Unit Cost | Notes |
|---|---|---|---|---|
| Requirements changes | 22 | 8 | $1200 | Late scope additions |
| Late approvals | 17 | 7 | $950 | Decision waiting time |
| Testing defects | 14 | 9 | $1500 | Rework during validation |
| Resource conflicts | 10 | 6 | $800 | Shared team bottlenecks |
| Vendor delays | 8 | 7 | $1100 | External dependency risk |
| Communication gaps | 6 | 5 | $500 | Missed handoff details |
Formula used
The tool can rank categories using different impact measures depending on the management question you want to answer.
- Frequency basis: Impact score = Occurrences
- Severity weighted basis: Impact score = Occurrences × Severity weight
- Cost impact basis: Impact score = Occurrences × Unit cost
- Composite basis: Impact score = Occurrences × Severity weight × Unit cost
- Share percentage: Share % = (Category impact ÷ Total impact) × 100
- Cumulative percentage: Cumulative % = Running total impact ÷ Total impact × 100
- Pareto threshold: Categories up to the first row that reaches the threshold are treated as the vital few.
Current selected formula: Impact score = Occurrences
How to use this calculator
- Enter a report title, project name, period, and preferred analysis basis.
- Add issue categories with their occurrence counts. Include severity and cost values when you need richer prioritization.
- Choose the cumulative threshold, usually 80%, to define the vital few group.
- Press Analyze now to rank categories, build the chart, and compute cumulative impact.
- Review the summary cards, chart, and ranked table to decide where corrective action should start.
- Use the export buttons to download the ranked output as CSV or PDF for meetings and reporting.
FAQs
1. What does a Pareto analysis show in project management?
It ranks issue categories from highest to lowest impact and adds a cumulative line. This helps teams identify the few causes that explain most schedule, quality, or cost disruption.
2. When should I use frequency instead of cost impact?
Use frequency when you want to reduce recurring problems regardless of cost. Use cost impact when financial exposure matters more than the number of occurrences.
3. Why include a severity weight?
Severity adjusts raw counts so serious issues carry more influence. This is useful when one rare defect is more damaging than many minor events.
4. What is the vital few group?
It is the smallest set of ranked categories needed to reach the selected cumulative threshold. Teams usually address this group first because it drives most impact.
5. Is 80% always the correct threshold?
No. Eighty percent is common, but some projects use 70%, 85%, or 90% depending on risk tolerance, budget limits, and the spread of issue types.
6. Can I analyze risks, defects, delays, or support tickets?
Yes. Any category-based project data works, including defects, change requests, delay causes, incidents, audit findings, or customer complaint sources.
7. What if many categories have similar scores?
That usually means impact is distributed more evenly. In that case, solving one category alone may not move results enough, so a broader action plan is needed.
8. Why export the results as CSV or PDF?
CSV supports further analysis in spreadsheets, while PDF is useful for review packs, stakeholder updates, sprint retrospectives, and governance documentation.