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HCI: Human Computer Interface definition

The term Human Computer Interface refers to the way a person experiences the computer, its application programmes, hardware components, output devices and functionality. It includes all aspects of the human's experience from the obvious ones of screen layout and selection options as well as input and output devices, reliability and accessibility.

To work with a system, the users need to be able to control the system and assess the state of the system. For example, when flying a plane, the pilot uses the stick to control the direction of the vehicle, and the throttle lever, brake pads and props to control the speed of the vehicle. The pilot perceives the position of the plane by looking through the windscreen and exact speed of the vehicle by reading the speedometer. The user interface of the aeroplane is composed of the instruments the pilot can use to accomplish the tasks of flying and maintaining the aeroplane.

The term user interface is often used in the context of computer systems and electronic devices. The user interface of a mechanical system, a vehicle or an industrial installation is often referred to as the human-machine interface (HMI).

In computer science and human-computer interaction, the user interface (of a computer program) refers to the graphical, textual and auditory information the program presents to the user, and the control sequences (such as keystrokes with the computer keyboard, movements of the computer mouse, and selections with the touch screen) the user employs to control the program.