Describe the structure of menus.

Structures of menus :

1. Single menus:
   • One screen or window for user input or action.
   • User makes choices only within that menu, no additional menus.
2. Sequential linear menus:
   • Series of screens in a set order.
   • Typically used for entering data or specifying parameters.
   • Users must go through all menus in a preset path.
3. Simultaneous menus:
   • All menu options visible at once.
   • Users can choose in any order, skip, and return later.
   • Helpful for reminding, comparing, and changing choices.
4. Hierarchical menus:
   • Choices become more refined as users navigate through options.
   • Represented like an inverse tree with branches.
   • Depth (traversal levels) and breadth (alternatives at each level) define the structure.
5. Connected menus:
   • Menus interconnected in a network.
   • Movement not limited to a tree structure.
   • Can be cyclical (both directions) or acyclical (one direction).
6. Event-trapping menus:
   • Background control over system state while users work.
   • Imposed on hierarchical menus.
   • Serve functions like immediate parameter changes, performing functions without leaving the current environment, or moving to a new environment.