Command: User types in a command. , Requires expertise. , Example :  DOS, Menu: Options are displayed as a hierarchy of (drop-down) menus, Disadvantage : can be difficult to find the exact option in sub menu., Example : Most Windows applications have this kind of bar at the top., GUI - Graphical User Interface: WIMP (Windows, Icons, Menus and Pointers), Example: Microsoft Windows, Advantages : No great level of IT skill needed, Handwriting recognition: User writes on a screen using a stylus, Example : Using a stylus to fill in a form, The software converts into text., Speech recognition: Microphones are used to input spoken commands., Important use is for the disabled., Useful for situations where computer users may not have free hands.,

Providing an Interface

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