A pareto chart is used to graphically summarize and display the relative importance of the differences between groups of data. The lengths of the bars represent frequency or cost (time or money), and are arranged with longest bars on the left and the shortest to the right. In this way the chart visually depicts which situations are more significant. Pareto Charts are used in cases: -When analyzing data about the frequency of problems or causes in a process. -When there are many problems or causes and you want to focus on the most significant. -When analyzing broad causes by looking at their specific components. -When communicating with others about your data.