The GUI is ready for entering data when it is in Input Mode. To determine if the model is in Input Mode, choose Mode on the menu. If Input has a check mark next to it, the GUI is in input mode. If it is not, select it from the menu to put the GUI into Input Mode. Then, when the mouse is double-clicked in the Map Window, a dialog box will open allowing the user to set model coefficients. There are coefficients for each catchment, river segment, and reservoir segment, and there are system coefficients which apply to the entire watershed.