Visit the computer lab at your institute. List the hardware available there and compare your list with the one in Table 11-2 If applicable, highlight any hardware devices not listed in the table that are available in your computer lab.

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TABLE 11-2 Common Devices for Interacting with an Information System Device Description and Primary Characteristics or Usage Keyboard Users push an array of small buttons that represent symbols that are then translated into words and com- mands. Keyboards are widely understood and provide considerable flexibility for interaction. Mouse Joystick Trackball Touch Screen Light Pen Graphics Tablet Voice A small plastic box that users push across a flat surface and whose movements are translated into cursor movement on a computer display. Buttons on the mouse tell the system when an item is selected. A mouse works well on flat desks but may not be practical in dirty or busy environments, such as a shop floor or check-out area in a retail store. Newer pen-based mice provide the user with more of the feel of a writ- ing implement. A small vertical lever mounted on a base that steers the cursor on a computer display. Provides similar func- tionality to a mouse. A sphere mounted on a fixed base that steers the cursor on a computer display. A suitable replacement for a mouse when work space for a mouse is not available. Selections are made by touching a computer display. This works well in dirty environments or for users with limited dexterity or expertise. Selections are made by pressing a pen-like device against the screen. A light pen works well when the user needs to have a more direct interaction with the contents of the screen. Moving a pen-like device across a flat tablet steers the cursor on a computer display. Selections are made by pressing a button or by pressing the pen against the tablet. This device works well for drawing and graphi- cal applications. Spoken words are captured and translated by the computer into text and commands. This is most appropri- ate for users with physical challenges or when hands need to be free to do other tasks while interacting with the application.