The Hierarchy Viewer graphically represents user hierarchies and the system hierarchy. In the system hierarchy, the connections between the attributes represent the parent-child relationships. In user hierarchies, the connections show the browse paths between the attributes. The Aerial perspective provides an overview of hierarchies; its decreased scale allows you to navigate through the entire project.
The Hierarchy Viewer is accessed from the Graphical View option in the Schema menu. The Hierarchy Viewer is discussed in further detail in Using the Hierarchy Viewer.