Specifying optimistic, pessimistic, and most likely or mode times are sufficient to generate the beta distribution describing completion times. The applet opens with values Optimistic = 2 weeks, Pessimistic = 11 weeks, and Mode = 4 weeks. Drag the mode line inside the distribution to see how the shape changes as expectations about the most likely outcome change. Drag between 0 and the current Optimistic value to change the Optimistic value. Drag, in either direction, beyond