Lean Tool - Pareto Charts - Focus on root causes and improvement ideas

Oct 12, 2026

Lean Tool – Pareto Charts describes how to visualize and prioritize the highest-impact opportunities. It guides users to list comparable problems or causes, define a standard measure (frequency, time, or cost), select a data timeframe, collect categorized observations, and subtotal results. The method ranks items from most to least by the measure, builds a bar chart with optional cumulative percentage, and uses the chart to identify the few items accounting for most of the problem. It then recommends further root-cause analysis and improvement planning, including an example table of potential causes and occurrence counts.

LanguageEnglish

CategoryGeneral

FormatPDF

Pages3

Reading Time1 min

AccessFree to download

Purpose

Application

Methodology

Steps 1-6

Steps 7-9

Focus example

Lean Tool – Pareto Charts Purpose • Visualization of highest impact opportunities Application • Used to help focus efforts on the opportunities that offer the greatest potential for improvement by showing their relative frequency or size in a visual format Methodology 1. Develop a list of problems, items or causes to be compared 2. Develop a standard measure for comparing the items • How often it occurs: frequency (e.g. , utilization, complications, errors) • How long it takes: time • How many resources it uses: cost 3. Choose a timeframe for collecting the data 4. Collect the data, recording the category each time it occurs 5. Subtotal the measurements for each item, how often it occurred (or cost or total time it took) . 6. List the items being compared in decreasing order of the measure of comparison: e.g. , the most frequent to the least frequent. Lean Tool -Pareto Charts 7. Create a bar graph with the list the items on the horizontal axis from highest to lowest. Label the left vertical axis with the numbers (frequency, time or cost) . Draw in the bars for each item • Microsoft Excel offers simple charting tools you can use to make your graphs, or you can do them with paper and pencil. • Adding a line to the graph showing cumulative percentage can also be helpful 8. Use the diagram to identify those items that appear to account for most of the problem 9. Further analyze the top problems to identify root cause and develop improvement ideas Focus on these 3 items 2 Lean Tool -Pareto Charts | Potential Cause | \# of occurrences | | --- | --- | | Boss told wrong time | 1 | | Receptionist didn't unlock door | 9 | | Forgot to set alarm | 2 | | Took wrong turn | 1 | | Car broke down | 1 | | Snow slowed down traffic | 2 | | Drank decaf coffee | 1 | | Alarm clock time incorrect | 14 | | Potential Cause | \# of occurrences | | --- | --- | | Alarm time incorrect | 14 | | Receptionist didn't unlock | 9 | | Forgot to set alarm | 2 | | Snow slowed down traffic | 2 | | Boss told wrong time | 1 | | Took wrong turn | 1 | | Car broke down | 1 | | Drank decaf coffee | 1 | Focus here 3

FAQs

What is the purpose of Pareto charts in Lean tools?

Pareto charts visualize the highest-impact opportunities by showing relative frequency or size, helping teams focus on what can drive the greatest improvement.

How do you choose the measure for comparing items?

Select a standard measure such as how often an item occurs (frequency), how long it takes (time), or how many resources it uses (cost).

How does Pareto chart output lead to improvement actions?

Identify the items that account for most of the problem, then further analyze the top causes to find root causes and develop improvement ideas.

Oct 12, 2026

Uploaded by Anna Hans