Abstract
It has been recognized that system design will benefit from explicit study of the context in which users
work. The unaided individual divorced from a social group and from supporting artifacts is no longer
the model user. But with this realization about the importance of context come many di icult
questions. What exactly is context? If the individual is no longer central, what is the correct unit of
analysis? What are the relations between artifacts, individuals, and the social groups to which they
belong? This chapter compares three approaches to the study of context: activity theory, situated
action models, and distributed cognition. I consider the basic concepts each approach promulgates
and evaluate the usefulness of each for the design of technology
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