A study was conducted to discover whether (1) use of each of the print and broadcast media could be correlated with subjects' knowledge level, and (2) whether controlling for dogmatism would increase the proportion of media users, with higher levels of knowledge among those less dogmatic, and decrease the proportion among the more dogmatic. Subjects were 347 adults in Brasilia, Brazil, who completed measures of dogmatism, knowledge of current events, and media use. Statistically significant associations were found between subjects' knowledge level and their use of the print media, but not of broadcast media. However, when a control for dogmatism was initiated, a statistically significant association between knowledge level and radio listening emerged among subjects who were relatively less dogmatic. The findings suggest that radio use can be very important in the education programs in developing nations. (FL)