<Li> Visual Based: The visual based human computer inter-action is probably the most widespread area in HCI (Human Computer Interaction) research . </Li> <Li> Audio Based: The audio based interaction between a computer and a human is another important area of in HCI systems . This area deals with information acquired by different audio signals . </Li> <Li> Task environment: The conditions and goals set upon the user . </Li> <Li> Machine environment: The environment that the computer is connected to, e.g. a laptop in a college student's dorm room . </Li>

What are the goals of human computer interaction