Icologiq Knowledge · Method
Pareto Analysis
A prioritization method that ranks problem or cause categories by frequency, cost or other impact so teams can focus investigation and improvement effort where it matters most.
Also known as:
Pareto Chart, Pareto Diagram, Pareto Analysis Chart
At a glance
Type
Method
Topic
CAPA & Incidents
Applies to
Cross-industry
Current version
Status
Last reviewed
September 29, 2026
Definition
Pareto Analysis is a data-based prioritization method commonly presented as a Pareto chart, with categories ordered from the largest contribution to the smallest and often combined with a cumulative percentage line. It helps teams see which types of problems, defects, incidents or suspected causes account for the greatest share of an observed effect. Pareto Analysis identifies where to focus attention; it does not by itself prove the underlying root cause.
Why it matters
Quality and QHSE teams often manage more incidents, findings, complaints and improvement opportunities than they can investigate with equal depth. Pareto Analysis helps them use actual occurrence, cost or impact data to identify where investigation and corrective-action effort is likely to create the greatest value. It is especially useful for trend reviews, management reporting and selecting recurring issue categories for deeper RCA.
Choose a clear population, time period and metric such as count, cost, downtime or severity.
Define the problem and measure
1
Group observations into categories that are distinct enough to compare without hiding important variation.
Categorize the data consistently
2
Aggregate the chosen measure by category and order results from largest to smallest.
Calculate totals and rank categories
3
Use bars and cumulative percentage to show how much of the total is represented by the leading categories.
Visualize cumulative contribution
4
Use the ranking to focus attention, then apply Root Cause Analysis rather than assuming the largest category explains why problems occur.
Prioritize investigation or action
5
Recalculate after improvement actions to see whether the distribution changed or new priorities emerged.
Repeat to monitor change
6
Method explained
Using Pareto Analysis to focus improvement effort
Pareto Analysis ranks categories by frequency, cost, impact or another meaningful measure so teams can see which contributors account for the largest share of a problem. It helps prioritize where deeper analysis may create the most value.
A systematic approach for identifying the underlying causes of a problem or event instead of addressing only its immediate symptoms.
Root Cause Analysis
Method
· CAPA & Incidents
A structured process for addressing causes of actual or potential problems through corrective or preventive measures and verifying that actions are effective.
CAPA
Process
· CAPA & Incidents
The structured process for reporting, assessing, investigating, following up and learning from incidents and related events.
Incident Management
Process
· Incident Management
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