80% of Problems Come from 20% of Causes — Pareto Analysis Identifies What Matters Most
The Pareto Principle
The Pareto Principle (the 80/20 rule) suggests that roughly 80% of effects come from 20% of causes. Applied to problem management, this means that a small number of root causes are responsible for the majority of incidents.
What Is Pareto Analysis?
Pareto Analysis is a statistical technique used to identify the most significant causes contributing to the problem. By focusing on the "vital few" rather than the "trivial many," teams can maximize the impact of their problem management efforts.
How to Perform Pareto Analysis
Step 1: Collect Data
Gather data on incident causes over a defined period:
- Track incident categories
- Record root causes
- Count frequency of each cause
Step 2: Categorize Causes
Group incidents by cause or category:
- What are the most common categories?
- What are the most frequent root causes?
- What systems have the most incidents?
Step 3: Sort and Calculate
- Sort causes from most frequent to least frequent
- Calculate the percentage of total incidents for each cause
- Calculate the cumulative percentage
Step 4: Create a Pareto Chart
- Bar chart showing frequency of each cause (descending)
- Line chart showing cumulative percentage
Step 5: Identify the "Vital Few"
- Identify causes that account for 80% of incidents
- Focus problem management efforts on these causes
Example Pareto Analysis
Data from a service desk:
|
Cause |
Count |
% of Total |
Cumulative % |
|
Password resets |
450 |
30% |
30% |
|
Application crashes |
300 |
20% |
50% |
|
Network issues |
250 |
17% |
67% |
|
Email problems |
180 |
12% |
79% |
|
Printer issues |
120 |
8% |
87% |
|
Other |
200 |
13% |
100% |
The "vital few" : Password resets, application crashes, network issues, and email problems account for 79% of incidents.
Action: Focus problem management on these four areas.
Benefits of Pareto Analysis
|
Benefit |
Impact |
|
Focus |
Teams concentrate on what matters most |
|
Resource allocation |
Invest where returns are highest |
|
Quick wins |
Fixing top causes has immediate impact |
|
Strategic planning |
Data-driven decision making |
When to Use Pareto Analysis
|
Scenario |
Use Case |
|
Many causes |
When there are too many potential causes to address all at once |
|
Data available |
When you have data on cause frequency |
|
Resource constraints |
When you need to prioritize |
|
Quick results |
When you need to show impact quickly |
Combining Pareto with Other Techniques
- Pareto identifies which causes to investigate (top 20%)
- 5 Whys investigates each of the top causes
- Ishikawa diagrams show the relationships
Conclusion
Pareto Analysis helps organizations focus on the "vital few" causes that generate the majority of incidents. By targeting these causes, problem management teams can have the greatest impact with limited resources.
Action Items for Your Organization
- Collect data on incident causes over a defined period
- Perform Pareto Analysis on the data
- Identify the "vital few" causes
- Focus problem management resources on these causes
- Track the reduction in incidents from top causes
