When designing an information system you must first consider the output. The output depends on the type of job. If very simple work is needed, you would use a monitor and printer. The basic input devices are the mouse and keyboard. The basic output devices are the monitor, speakers, and printer. I need to consider alternatives so I can get the best out of my system. The purpose of an input device is to input data or information so that it can be converted into the system. Input devices must be fast and accurate. The cost of the product must be reasonably low. The main input devices in use today are: Keyboard Web Camera JoyStick MICRMouse Scanner Digital cameraOCR/PMR Barcode readersMicrophoneI have an optical wheel mouse and a QWERTY keyboard.KeyboardKeyboards are the oldest and most familiar type of input device. input. The way a keyboard works requires that each button pressed closes a switch. This releases a code that the computer converts to the relevant character. The keyboard is called a QWERTY keyboard because of the letters on the top right.