Pareto Analysis in Six Sigma DMAIC
In the Measure and Analyze phases, Pareto charting helps Green and Black Belts prioritize project scope by identifying the highest-leverage defect categories.
Foundational Category: Problem Solving & Improvement • ~5 min read
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Pareto Analysis (80/20 Rule) Chart
Isolate the vital few quality defects or downtime causes from the trivial many.
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Q:
What is the 80/20 Pareto Principle in Quality Engineering?
The Pareto Principle states that roughly 80% of defects or downtime stem from 20% of root causes (the "vital few"). A Pareto chart combines sorted bar heights with a cumulative percentage line.
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Downtime Log Input
$/hour
Total Downtime
640 min
10.7 hoursFinancial Loss
$4,800
At $450/hrVital Few Causes
2 of 6
80% of total lossPareto 80/20 DistributionDashed Line = 80% Cutoff
| Failure Cause | Downtime | Count | MTTR | Cum % |
|---|---|---|---|---|
| Hydraulic Valve Leak | 240 min | 4 | 60.0 min | 37.5% |
| Conveyor Jam | 180 min | 12 | 15.0 min | 65.6% |
| Motor Overheat | 110 min | 2 | 55.0 min | 82.8% |
| Sensor Alignment | 55 min | 11 | 5.0 min | 91.4% |
| Pneumatic Pressure Drop | 30 min | 3 | 10.0 min | 96.1% |
| Operator Adjustment | 25 min | 5 | 5.0 min | 100.0% |
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Engineering Disclaimer:
These tools and calculators are intended for engineering analysis, educational study, and operational guidance. They do not constitute formal regulatory certification (such as medical, aerospace flight-critical, or statutory safety filings) without independent audit and sign-off by a certified Quality Engineer or Six Sigma Black Belt. AshToolbox is not affiliated with, sponsored by, or endorsed by AIAG, ISO, ASQ, or any standards body.
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