The STEM user interface is organized into three "perspectives", Designer perspective , a Simulation perspective and an Analysis perspective. A perspective is a collection of "editors", "views", "menu bar", "tool bar" and a "perspective bar". An editor is a sub-window used to interactively modify one of STEM's components while a view is a sub-window used to display information to a user. The menu bar contains high-level menus for options and operations that can be selected by a user, while the tool bar contains icons that if selected (clicked on) cause STEM to perform actions. The perspective bar is used to switch between STEM's perspectives. These are illustrated in the image in Figure 1 below.
Similarly in the image in Figure 2 below, is STEM's Simulation perspective. Note that it does not have an editor area.