1. Calculate using Hick-Hyman's expression, the total reaction time to select a menu item at 3rd level. Main menu has 4 submenus, each submenu has 3 sub-sub menus and each sub-sub menu has 5 options to choose from.
2. What holds good for horizontal menus will also hold good for vertical menus. Comment.
3. In which situation is Hicks' Law logarithmic and in which situation is it linear?
