GUI menus are used to control PC software and have the following guidelines:
1. The main menu bar is always displayed.
2. The main menu uses single words for menu items. Main menu options always
display secondary pull-down menus.
3. The main menu should have secondary options grouped into similar sets of
features.
4. The drop-down menus that display when a main menu item is clicked often
consist of more than one word.
5. These secondary options perform actions or display additional menu items.
6. Menu items in grey are unavailable for the current activity.