This lecture describes a theoretical framework for the behavioural
sciences that holds high promise for theory-driven research and
design in Human-Computer Interaction. The framework is designed to
tackle the adaptive, ecological, and bounded nature of human
behaviour. It is designed to help scientists and practitioners
reason about why people choose to behave as they do and to explain
which strategies people choose in response to utility, ecology, and
cognitive information processing mechanisms. A key idea is that
people choose strategies so as to maximise utility given
constraints. The framework is illustrated with a number of examples
including pointing, multitasking, skim-reading, online purchasing,
Signal Detection Theory and diagnosis, and the influence of
reputation on purchasing decisions. Importantly, these examples
span from perceptual/motor coordination, through cognition to
social interaction. Finally, the lecture discusses the challenging
idea that people seek to find optimal strategies and also discusses
the implications for behavioral investigation in HCI.
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