A training experiment was initiated at a radar station of the United States Air Force. External and unanticipated events so attenuated the experimental conditions that the effects cannot be evaluated unambiguously. However, the change in performance of crews supports the notion that knowledge of results and discussions contribute to improvement by helping to develop understanding of the environment and common modes of response among members of a group. The paper describes the study and details the changes in performance in relation to the kinds of information available to the crows.
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