In this article we describe an instructional program that focuses on applying causal reasoning and related principles of the scientific method to problems faced in daily life. In a highly interactive classroom setting, the instructor gives students repeated opportunities to apply methodological reasoning to real-world scenarios for the purpose of making informed decisions. In addition to describing the program, we report the findings of a capstone exercise that examined changes in students' beliefs toward legalization of marijuana after reading persuasive communications. Students who experienced the instructional program exhibited less bias in evaluating information and less attitude polarization than students in a comparison group. We discuss the implications of these findings for developing and evaluating instructional programs in methodological reasoning in psychology.
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