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Interest in how people make judgments about the likelihood of future events has sparked a lively area of theory and research over the past decade. The psychology of prediction has burgeoned across the traditional psychological interest areas. The intriguing and compelling work of Kahneman and Tversky (1972) has motivated a number of studies that demonstrate how subjects utilize important information inappropriately and are less than accurate in making predictions when compared with normative models. Since this original work, several researchers (Lyon and Slovic, 1976, Bar-Hillel, 1977, Ajzen, 1977) have manipulated aspects of the information provided subjects during performance of a prediction task in an attempt to determine when and under what conditions certain types of information are used or ignored.