| Summary: | Kenneth R. Hammond
(1917--2015) made several major contributions to the science of human judgment
and decision making. As a student of Egon Brunswik, he kept Brunswik’s legacy
alive – advancing his theory of probabilistic functionalism and championing his
method of representative design. Hammond pioneered the use of Brunswik’s lens
model as a framework for studying how individuals use information from the task
environment to make clinical judgments, which was the precursor to much `policy
capturing’ and `judgment analysis’ research. Hammond introduced the lens model
equation to the study of judgment processes, and used this to measure the
utility of different forms of feedback in multiple-cue probability learning. He
extended the scope of analysis to contexts in which individuals interact with
one another – introducing the interpersonal learning and interpersonal conflict
paradigms. Hammond developed social judgment theory which provided a
comprehensive quantitative approach for describing and improving judgment
processes. He proposed cognitive continuum theory which states that
quasi-rationality is an important middle-ground between intuition and analysis
and that cognitive performance is dictated by the match between task properties
and mode of cognition. Throughout his career, Hammond moved easily from basic
laboratory work to applied settings, where he resolved policy disputes, and in
doing so, he pointed to the dichotomy between theories of correspondence and
coherence. In this paper, we present Hammond’s legacy to a new generation of
judgment and decision making scholars.
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