“…On tests measuring critical thinking, analysis, and logical reasoning, debaters repeatedly score higher than nondebaters, and this advantage increases with the skill and experience of the debater (Bradley and Mulvaney, 1964;Gruner et al, 1971;Semlack and Shields, 1977). Although it is likely that this correlation results in part from self-selection, several longitudinal studies (Howell, 1943;Huseman et al , 1972) show that students instructed in argumentation and debate show much improvement on such tests, gaining significantly more than their nondebating peers. In one study, for example, Brombeck (1949) tested 202 argumentation students and matched controls at eleven colleges and universities , using a battery of Watson-Glaser Critical Thinking Tests (including measures of skill in logical reasoning, inference, discrimination of arguments, and evaluation of arguments) .…”