Each module appears on its own level of a model. When you view the top level of a hierarchy, you see the Interface, Map, Model, and Equation layers for the model as a whole, with icons for modules indicated on the Map and Model layers.
When you navigate into a module within the hierarchy, the Map and Model layers show you only the information contained within the module (including icons for any other modules that are contained within the module).
The Equation layer always shows information for the current level and for all modules contained inside or below the current level. On the Equation layer, you can view equations sorted by module by selecting the Module option in the Equation Preferences dialog box.
Note: The Interface layer is not available when you are viewing a module. Only the top-level model in a hierarchical model has an Interface layer. If you create a module by importing a model that has an interface, the interface is not visible when you view the module, but the interface is visible if you open the module as a stand-alone model.
On the Map or Model layer, double-click the module icon.
The module appears on the module's Map or Model layer. The module's name appears in square brackets after the model’s name in the window’s title bar.
Note: You cannot navigate into a module until you have created or imported a model for it.
Tip: You can also use CTRL+double-click (Windows) or Command-double-click (Mac) on the diagram's surface to navigate up one level.