Menu dynamics

• The menu item that is currently being touched by the cursor symbol should be highlighted.
• Submenus of the currently touched menu item should be shown (30% less search time and 50% less errors for beginning users, Snowberry et al., 1985).
• Selected options in the menu should remain checked.
• It must be possible to leave the menu without selecting any item (since users may have erronously launched the menu, or just want to explore the system) 
• Positional constancy in menu entries is important. If an item is not available at the moment, it must nevertheless remain in the menu, but should be made less prominent (e.g., grey color)
  Adding contingent submenus is probably o.k. as long as visual changes are minor   
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• Menus should be easily visible against all possible backgrounds.