Social categorization theory contains significant inferences for human communication research. The effect of common fate by subject inclusion in convergent or divergent experimental categories was ascertained by manipulation with Australian students who evaluated bogus Aboriginal art. Whereas previous research shows that social categorization produces negative attitudes and behavior, the current study showed that common fate produced positive attitude change. Consequently, the social categorization process can work both ways. Conclusions discuss the generic nature of group categorization. (Author)