The study of HCI is essentially a multidisciplinary science because "it is concerned with understanding how people make use of devices and systems that incorporate or embed computation, and how such devices and systems can be more useful and usable (Carroll 2003, p. 1)." Researchers of HCI analyze and design user interfaces and new technologies. They also need to understand the tasks and work practices of people and their environments. It is by the collective knowledge of system engineering and human psychology that HCI professionals can offer better computational support to end users.