Abstract
A description of an instrument designed to facilitate concept attainment research. The Concept Attainment Device (CAD) was built to reduce several sources of E error in concept attainment experiments. S is presented with a 64 stimulus-position board. Associated with each of these positions are two response-key-feedback-lights. S's card choices are displayed on E's console in a decimal read-out. S's hypotheses are automatically checked for accuracy by CAD. Problems may be easily changed, and the amount of information displayed to S may be systematically varied. CAD is especially useful in concept attainment experiments on selection strategies, rate of information acquisition, and accuracy of information utilization.
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