This interactive visualization compares project schedule risk distributions using overlapping circles. A dropdown menu selects among three probability distributions—triangular, bootstrap, and bootstrap-rate—derived from a fictitious schedule simulation dataset. For each selection, 1,000 duration values are plotted as concentric circles scaled by the square root of each value using `d3.scaleLinear`, with transitions animating radius changes via `transition.duration`. A red circle highlights the mean duration for the chosen distribution. The SVG rendering uses D3 v5 data joins and the custom `dropDownMenu` module.