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 "title": "Pareto analysis",
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 "excerpt": "Pareto analysis is a decision-making method that ranks problems by frequency or size so effort concentrates on the few causes behind most of the effect, summarized as the 80/20 rule.",
 "snippet": "Pareto analysis is a decision-making method that ranks problems by frequency or size so effort concentrates on the few causes behind most of the effect, summarized as the 80/20 rule.",
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 "markdown": "# Pareto analysis\n\nPareto analysis is a decision-making method that ranks problems or causes by their frequency or size so that effort can be concentrated on the small number of factors that produce most of the effect.<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> It rests on the [Pareto principle](https://www.edgepedia.org/pareto-principle), the observation that a large share of results typically comes from a small share of causes, summarized as the 80/20 rule.<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> The output is a ranked list and a [Pareto chart](https://www.edgepedia.org/pareto-chart), a descending bar graph with a cumulative-percentage line, and the decision it supports is which problems to work on first.<sup>[2](https://aqua.nhs.uk/wp-content/uploads/2023/07/qsir-pareto.pdf)</sup> Its stated purpose is to \"focus efforts on the problems that offer the greatest potential for improvement by showing their relative frequency or size in a descending bar graph.\"<sup>[3](https://www.aits.uillinois.edu/UserFiles/Servers/Server_474/File/Professional_Services/BPI/BPI-ParetoChart-HowToGuide.pdf)</sup>\n\n| Key fact | Detail |\n|---|---|\n| Purpose | Rank causes by frequency or cost to find the \"vital few\" driving most of the effect<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> |\n| 80/20 rule | A rough guide about typical distributions; the numbers are not exact and may not total 100%<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> |\n| Chart components | Bars in descending order, percentage scale, and a cumulative-percentage line<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> |\n| Vital-few cutoff | Factors accumulated up to the point where the cumulative line reaches about 80%<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> |\n| Data volume | At least 50 data points recommended when choosing the collection period<sup>[4](https://quorum.hqontario.ca/Portals/0/QI-Tools-and-Resources/Pareto-Chart-Tool.pdf)</sup> |\n| Category rule | An \"other\" bucket above 25% of causes should be broken down further<sup>[5](https://www.sars.org.uk/BOK/Applied%20R&M%20Manual%20for%20Defence%20Systems%20%28GR-77%29/p4c05.pdf)</sup> |\n| Tool family status | Recognized as one of the seven basic quality tools for process improvement<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> |\n\n## How it works\n\nThe logic is cumulative. Causes are sorted from most to least frequent, and a running percentage shows how much of the total effect each additional cause adds. When the cumulative line reaches roughly 80%, the factors added so far are treated as the vital few, and the remainder as the trivial many (some practitioners prefer the label \"useful many\").<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> The 80/20 rule is a rough guide about typical distributions, not an exact law; observed splits may be 70/30 or 90/10, and the practical target is a natural break in the cumulative curve where the slope flattens, signaling diminishing returns from addressing further categories.<sup>[6](https://metricgate.com/docs/pareto-analysis/)</sup> The principle was applied to quality control and found that 80% of problems stem from 20% of possible causes, while stressing that the numbers are not absolutes.<sup>[7](https://extension.oregonstate.edu/catalog/em-8771-statistical-process-control-part-3-pareto-analysis-check-sheets)</sup>\n\nRecent formal work supports this caution. Simulated datasets of size between \\( 10^{2} \\) and \\( 10^{5} \\) following a truncated exponential distribution tend to satisfy a generalized principle close to the canonical 0.2/0.8 rule, but power-law (heavy-tailed) data produce more extreme concentration, and the authors caution against using the canonical 20/80 rule as a universal yardstick.<sup>[8](https://arxiv.org/html/2602.11131)</sup>\n\n## How it is done\n\nThe [American Society for Quality](https://www.edgepedia.org/american-society-for-quality) procedure has nine steps: choose categories, choose a measurement (frequency, quantity, cost, or time), choose a time period, collect data, subtotal each category, set the scale, construct the bars, calculate percentages, and draw the cumulative sums.<sup>[9](https://asq.org/quality-resources/pareto)</sup> Practical guides add framing steps. [Ontario Health](https://www.edgepedia.org/ontario-health) advises using a fishbone diagram beforehand to inform the data categories and collecting at least 50 data points.<sup>[4](https://quorum.hqontario.ca/Portals/0/QI-Tools-and-Resources/Pareto-Chart-Tool.pdf)</sup> All contributors must be measured with the same measure; ranking by different measures on one diagram is \"comparing apples to oranges.\"<sup>[10](https://www.juran.com/blog/how-to-construct-a-pareto-diagram/)</sup>\n\nIn a spreadsheet, the sequence is to list factors and frequencies, sort descending, compute cumulative frequency and cumulative percentage, add a fixed 80% cut-off column, insert a [bar chart](https://www.edgepedia.org/bar-chart), and convert the cumulative series to a line on the secondary axis.<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> Analysis then looks for the breakpoint, a marked change in the slope of the cumulative graph separating the significant few from the trivial many.<sup>[11](https://balancedscorecard.org/wp-content/uploads/pdfs/pareto.pdf)</sup> Small categories can be grouped as \"other,\" and the cumulative line's last dot should reach 100% on the right scale.<sup>[9](https://asq.org/quality-resources/pareto)</sup> Tooling has automated chart construction and prioritization: a 2026 web-based decision support system automates Pareto-based selection for pharmacy inventory procurement, replacing a manual process that was time-consuming and subject to evaluator bias,<sup>[12](https://journal.aira.or.id/jistr/article/view/1447)</sup> and [Microsoft Excel](https://www.edgepedia.org/microsoft-excel) provides two built-in Pareto templates, one for cost analysis and one for problem analysis.<sup>[3](https://www.aits.uillinois.edu/UserFiles/Servers/Server_474/File/Professional_Services/BPI/BPI-ParetoChart-HowToGuide.pdf)</sup>\n\n## Origin\n\n Sources date his wealth-distribution observation differently: one clinical guide places it in the 19th century, noting that 80% of Italy's land was owned by 20% of the population,<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup> while a financial reference states he discovered it in 1906.<sup>[13](https://www.investopedia.com/terms/p/pareto-analysis.asp)</sup> Quality defects are unequal in frequency, and a form of cumulative curve can depict wealth distribution graphically.<sup>[14](https://www.juran.com/wp-content/uploads/2021/03/The-Non-Pareto-Principle-1974.pdf)</sup> The same essay and software documentation mention the terms \"Pareto chart\" and \"Pareto analysis.\"<sup>[15](https://www.ncss.com/wp-content/themes/ncss/pdf/Procedures/NCSS/Pareto_Charts.pdf)</sup>\n\n## Variants\n\nNamed variations include the weighted Pareto chart and comparative Pareto charts.<sup>[9](https://asq.org/quality-resources/pareto)</sup> Weighting addresses the fact that frequency alone ignores cost: relative cost = relative frequency \\( \\cdot \\) average cost, where average cost = (scrap cost) \\( \\cdot \\) (% scrap) + (rework cost) \\( \\cdot \\) (% rework); a worked example gives \\( 0.41 \\cdot \\$12 = \\$4.92 \\).<sup>[7](https://extension.oregonstate.edu/catalog/em-8771-statistical-process-control-part-3-pareto-analysis-check-sheets)</sup> The Pareto-Lorenz diagram combines the ranked bars with the Lorenz cumulative curve; a 2024 paperboard-packaging study used it alongside other tools and found results consistent with the 80/20 rule.<sup>[16](https://reference-global.com/article/10.2478/czoto-2024-0016)</sup> A six-step procedure adds scoring and grouping problems by root cause before summing scores per group.<sup>[17](https://www.mdpi.com/2076-3387/13/2/51)</sup>\n\n## Applications\n\nPareto analysis is used across manufacturing quality, healthcare, logistics, safety, and inventory management. In a headrest-cover production case at Grammer AD, the top three defects (loose decorative seam 32%, material defect 25%, uneven closing seam width 19%) formed 76% of the product family's scrap, with total internal scrap losses of €40,929 in October 2019.<sup>[18](https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/67/e3sconf_fpepm2020_03007.pdf)</sup> In healthcare, an Institute for Healthcare Improvement example found that three of eight surgical set-up error types, Wrong Supplier (67 of 144), Excess Count (24), and Too Few Count (17), accounted for 75% of all errors, so the team focused on those three.<sup>[19](https://www.upstate.edu/nursing/documents/qi_tool_paretochart.pdf)</sup> The chart is used mainly in problem identification but also in data analysis and outcome evaluation phases of quality improvement projects.<sup>[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)</sup>\n\n## Limitations and alternatives\n\nPareto analysis does not provide solutions; it only identifies causes, and it relies on past data with no guarantee of future relevance.<sup>[13](https://www.investopedia.com/terms/p/pareto-analysis.asp)</sup> It ranks by frequency alone unless costs are explicitly assigned, so a rare but catastrophic defect may rank low yet deserve priority, and vague or overlapping category definitions reduce actionability.<sup>[6](https://metricgate.com/docs/pareto-analysis/)</sup> It can also exclude problems that are small initially but grow with time, and misapplied category choices distort results.<sup>[5](https://www.sars.org.uk/BOK/Applied%20R&M%20Manual%20for%20Defence%20Systems%20%28GR-77%29/p4c05.pdf)</sup> Counting itself can fail: in one experiment, five inspectors' scrap and rework rate estimates varied from 34% to 49% because they disagreed on defect categories, which [check sheets](https://www.edgepedia.org/check-sheet) standardize.<sup>[7](https://extension.oregonstate.edu/catalog/em-8771-statistical-process-control-part-3-pareto-analysis-check-sheets)</sup> What is perceived as the chief cause may simply be the \"loudest\" or most visible one.<sup>[4](https://quorum.hqontario.ca/Portals/0/QI-Tools-and-Resources/Pareto-Chart-Tool.pdf)</sup> If the cumulative line looks flat or gently sloping, the principle may not hold, and the data could be categorized differently rather than necessarily recategorized.<sup>[11](https://balancedscorecard.org/wp-content/uploads/pdfs/pareto.pdf)</sup><sup> • </sup><sup>[23](https://www.saferpak.com/pareto_articles/howto_pareto.pdf)</sup> A 2026 framework for zero-defect manufacturing combines a quality failure impact index, [SHAP](https://www.edgepedia.org/shap) explainability, and one-dimensional sensitivity analysis into an integrated priority score, arguing that frequency-only prioritization is insufficient.<sup>[20](https://link.springer.com/article/10.1007/s00170-026-19063-9)</sup>\n\nAs a prioritization tool, it answers which problem to investigate first, not the root cause itself, which is the job of 5 Whys or fishbone analysis; a classic DMAIC Analyze-phase sequence is Pareto → Fishbone → 5 Whys, while FMEA is a proactive tool producing a risk register with \\( RPN = S \\cdot O \\cdot D \\).<sup>[21](https://5xwhys.com/articles/rca/tools-comparison/)</sup> The fishbone diagram complements Pareto charts by generating the causes that Pareto then prioritizes,<sup>[22](https://www.ncbi.nlm.nih.gov/books/NBK607994/)</sup> and the NHS recommends using a Pareto chart after completing a fishbone diagram to decide which causes to work on first.<sup>[2](https://aqua.nhs.uk/wp-content/uploads/2023/07/qsir-pareto.pdf)</sup> Complementary tools include FMEA, Fault Tree Analysis, scatter diagrams, run charts, and flow charts.<sup>[5](https://www.sars.org.uk/BOK/Applied%20R&M%20Manual%20for%20Defence%20Systems%20%28GR-77%29/p4c05.pdf)</sup>\n\n## References\n\n1. [A Practical Guide to Creating a Pareto Chart as a Quality Improvement Tool (Glob J Qual Saf Healthc, 2021, doi: 10.36401/JQSH-21-X1)](https://pmc.ncbi.nlm.nih.gov/articles/PMC10228985/)\n2. [Pareto analysis (NHS England Quality, Service Improvement and Redesign tool)](https://aqua.nhs.uk/wp-content/uploads/2023/07/qsir-pareto.pdf)\n3. [Pareto Chart How-to Guide (University of Illinois)](https://www.aits.uillinois.edu/UserFiles/Servers/Server_474/File/Professional_Services/BPI/BPI-ParetoChart-HowToGuide.pdf)\n4. [Pareto Analysis – Instruction (Ontario Health / Quorum)](https://quorum.hqontario.ca/Portals/0/QI-Tools-and-Resources/Pareto-Chart-Tool.pdf)\n5. [p4c05 (sars.org.uk)](https://www.sars.org.uk/BOK/Applied%20R&M%20Manual%20for%20Defence%20Systems%20%28GR-77%29/p4c05.pdf)\n6. [Pareto Analysis Calculator | MetricGate](https://metricgate.com/docs/pareto-analysis/)\n7. [Statistical Process Control: Part 3, Pareto Analysis and Check Sheets (OSU Extension Service)](https://extension.oregonstate.edu/catalog/em-8771-statistical-process-control-part-3-pareto-analysis-check-sheets)\n8. [Formalization of the generalized Pareto principle and structural typicality of the 20/80-rule (arXiv)](https://arxiv.org/html/2602.11131)\n9. [What is a Pareto Chart? Analysis & Diagram | ASQ](https://asq.org/quality-resources/pareto)\n10. [How to Construct a Pareto Diagram (Juran Institute)](https://www.juran.com/blog/how-to-construct-a-pareto-diagram/)\n11. [Basic Tools for Process Improvement: Pareto Chart (US Navy/balancedscorecard.org)](https://balancedscorecard.org/wp-content/uploads/pdfs/pareto.pdf)\n12. [A Web-Based Decision Support System for Inventory Procurement Optimisation Using Pareto Analysis (JISTR, 2026)](https://journal.aira.or.id/jistr/article/view/1447)\n13. [Pareto Analysis: Definition, How to Create a Pareto Chart, and Example](https://www.investopedia.com/terms/p/pareto-analysis.asp)\n14. [The Non-Pareto Principle; Mea Culpa (Joseph M. Juran, 1974)](https://www.juran.com/wp-content/uploads/2021/03/The-Non-Pareto-Principle-1974.pdf)\n15. [Pareto Charts (NCSS statistical software documentation)](https://www.ncss.com/wp-content/themes/ncss/pdf/Procedures/NCSS/Pareto_Charts.pdf)\n16. [Prioritizing Product Quality Problems Using Quality Management Tools (Knop & Gejdos, Dec 2024)](https://reference-global.com/article/10.2478/czoto-2024-0016)\n17. [Analysis of Warehouse Value-Added Services Using Pareto as a Quality Tool: A Case Study of Third-Party Logistics Service Provider (Administrative Sciences, MDPI)](https://www.mdpi.com/2076-3387/13/2/51)\n18. [Analysis of defects and their impact on the production losses using Pareto diagrams (E3S Conferences, 2020)](https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/67/e3sconf_fpepm2020_03007.pdf)\n19. [QI Essentials Toolkit: Pareto Chart (Institute for Healthcare Improvement)](https://www.upstate.edu/nursing/documents/qi_tool_paretochart.pdf)\n20. [A novel explainable quality failure impact framework for data-driven defect prioritization toward zero-defect manufacturing (Int J Adv Manuf Technol, 2026)](https://link.springer.com/article/10.1007/s00170-026-19063-9)\n21. [Root Cause Analysis Tools Compared: 5 Whys, Fishbone, FMEA, Pareto](https://5xwhys.com/articles/rca/tools-comparison/)\n22. [Quality Tools and Techniques (Fishbone Diagram, Pareto Chart, Process Map) - StatPearls](https://www.ncbi.nlm.nih.gov/books/NBK607994/)\n23. [saferpak.com](https://www.saferpak.com/pareto_articles/howto_pareto.pdf)\n\n---\n*Topic: Encyclopedia › Society and history › Economics and business › Business and work*\n\n*Initially written Sep 29, 2026 · Edited: Oct 15, 2026; Oct 21, 2026*\n\n*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*\n\nLicense: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license\n",
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