Navigation in a world determines how scenes are connected to one another, and how the user can change the data display or access more information.
Start your navigation plan by specifying one layout for each scene and design a single overview scene that acts like a menu for accessing individual scenes. Later, you can consolidate some of the individual scenes into multi-layout scenes or hidden levels of detail contained in a single scene. From this general structure, you can determine routes--which scene is connected to which.