Abstract
The introduction of information technology based on digital computers
for the design of man-machine interface systems has led to a requirement
for consistent models of human performance in routine task environments
and during unfamiliar task conditions. A discussion is presented
of the requirement for different types of models for representing
performance at the skill-, rule-, and knowledge-based levels, together
with a review of the different ways in which information is perceived
at these different levels in terms of signals, signs, and symbols.
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