The authors examined the effect a curriculum about cooperative businesses had on high school student attitudes toward these businesses. Cognitive, affective, and behavioral dimensions were measured before and after participating in the curriculum. Older high school students increased their attitudes toward cooperatives more than did younger students. Students with prior exposure to cooperatives had increases in positive attitudes toward cooperatives. Larger increases were increased in positive attitudes in female students than male students. Finally, students in regions of North Dakota with relatively fewer cooperatives per square mile had larger increases in positive attitudes. (Contains 3 tables.)