The Drilldown Pie Chart viewlet has the same functionality and configuration as the Drilldown Column Chart. By clicking on specific slices of the chart, the user can “drill down” to levels contained within the higher group. The groups beneath each section are constantly totaled, thus giving their percentage of the whole and specific value at all times. Percentage numbers can be viewed by hovering over corresponding slices of the pie chart. This viewlet can be helpful for organizing comparisons with multiple levels of data, such as a university divided into campuses, dorms, halls, etc.