Which statement best describes Pareto chart insights?

• A. It shows the distribution of defects across categories.
• B. It ranks problems by frequency to help prioritization.
• C. It displays the range of data.
• D. A small number of causes account for most effects.

Answer: (D)

Pareto charts reveal that a small number of causes drive most of the problems. By ordering categories from the most significant to the least and showing a cumulative impact, you can see how a few issues account for the bulk of the effects. This makes it clear where to focus improvement efforts to achieve the largest payoff. While the chart does help with prioritization by ranking issues, the key insight is the concentration of impact among a limited set of causes. It isn’t about the overall spread of data across categories, nor about the data range.