The present investigation employed Kahneman and Tversky's (1973) "Cab Problem" and the "Shuttle Problem" (a modified version of the former) in two separate experiments to further examine the impact of several variables on the utilization of base-rate information, and to what extent gender is related to the utilization of non-diagnostic base-rate information. Experiment One tested 216 tested undergraduate students to investigate the effects of gender, order of information, and the accuracy of case-specific information on the utilization of diagnostic base-rate information. Diagnostic base-rate information in Experiment One was information that should have been incorporated into subjects' probability estimates. Significant main effects were found for "Order of Information" and"Witness Accuracy Rate". In Experiment Two, non-diagnostic base rates were presented to 155 undergraduates. Non-diagnostic base rates were information that should not have been incorporated into individuals' probability estimates. Significant main effects for "Gender" and "Out-of-Commission Rate" suggest that subjects encounter difficulty when deciding what type of information is relevant to word problems and that quite possibly, individual differences and inappropriate applications of basic arithmetic may be responsible for some errors in more traditional base-rate investigations. (ABL)