A great deal of early research on judgment and decision-making was:

Question

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Early research on judgment and decision-making was primarily focused on identifying and manipulating single variables to observe their effects on decision-making. This approach allowed researchers to establish causal relationships between variables and decision outcomes. Other methods, such as archival research, public opinion research, and observational research, may have been used as complementary approaches, but were not the primary focus of early research in this field.

A Great Deal of Early Research on Judgment and Decision-Making