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The computer can be thought of from the perspective of its technology [...] from the field of computer science. Or it can be thought of as a social tool, a structure that will change social interaction and social policy, for better or for worse. It can be thought of as a personal assistant, where the goals and intentions of the user become of primary concern. It can be viewed from the experience of the user, a view that changes considerably with the task, the person, the design of the system. The filed of human-computer interaction needs all these views, all these issues, and more besides.
-- Stephen Draper and Donald Norman. In "User Centered System Design" (1986) p. 1
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