Menus should have a limited number of items in breadth and in depth.
Additional Information:
Moderate menu breadth (e.g., number of menus in a menu hierarchy, number of menu categories in a menu bar, or number of pop-up menus) and depth (e.g., number of items per menu or, in menu bars, per menu category) should be facilitated by the use of a hierarchical menu structure whereby the selection of items from one menu (the parent) activates a second menu (the child) with further options. The parent menu should remain visible during the selection of the child menu. The number of levels in the hierarchy should be limited (for example, to no more than three).