Pareto Analysis

Pareto analysis is a **statistical technique** used in **quality management and process improvement** to identify and prioritize the most significant causes of problems. It is based on the **Pareto principle (80/20 rule)**, which states that roughly **80% of effects (e.g., defects, costs, delays) come from 20% of causes**. The **Pareto chart** is a **bar chart** that displays categories (e.g., defect types) in **descending order of frequency or cost**, with a **cumulative percentage line** superimposed to highlight the 'vital few' causes (those contributing the most to the problem). Key steps in Pareto analysis: **1) Collect and categorize data** (e.g., defect counts), **2) Sort categories by frequency/cost in descending order**, **3) Calculate individual and cumulative percentages**, **4) Plot the bars and cumulative line**, and **5) Identify the 'vital few'** (typically the first 20-30% of categories that account for ~80% of the total effect). Applications: Prioritizing **quality improvement efforts**, allocating **limited resources** (e.g., time, budget) to high-impact areas, and guiding **root cause analysis** (e.g., using fishbone diagrams for the 'vital few'). Limitations: Pareto analysis **requires categorical data** (not continuous), focuses on **static snapshots** (not trends over time), and may **overlook interactions between causes**. It is most effective when combined with other tools like **check sheets** (for data collection) and **fishbone diagrams** (for root cause analysis).