You meet with your quality team to review their findings, where a Pareto Diagram is used to represent the :

• A. Specific issues that occur most frequently
• B. Correlation between two variables
• C. Effects of a variable over time
• D. Variation among a sample set

Answer: (A)

Pareto diagrams are used to identify which issues occur most frequently and contribute most to a problem. By listing categories as bars in descending order of frequency (or impact) and adding a cumulative line, this chart highlights the few problems that drive most of the quality concerns. This enables the team to prioritize corrective actions where they’ll have the biggest effect, aligning with the idea that a small number of causes often account for the majority of problems (the 80/20 principle).

In contrast, a chart that shows correlation between two variables would be a scatter diagram, which isn’t about prioritizing issues by frequency. A chart showing how a variable changes over time would be a time-series or trend chart, not a Pareto. A histogram displays variation within a dataset, not the frequency of distinct issue categories.