This paper presents the findings of a review of 13 studies of attitudes toward individuals who use augmentative and alternative communication (AAC). The following factors that influenced attitudes were found: characteristics of typically developing individuals, characteristics of the person using AAC, and characteristics of AAC systems' output. This research base indicates that females reported more positive attitudes than males, and that individuals with previous experience with people with disabilities reported more positive attitudes than did individuals who had no previous experience with people with disabilities. The AAC system and other factors studied did not appear to be influential as single factors; however, data from the studies reviewed provide support for the hypothesis that attitudes are formed by the interaction of many different factors. There has been limited research in techniques to change attitudes toward individuals who use AAC. A recommendation from this review is that future research should focus on strategies to modify both attitudes and behavior in order to reduce barriers to social interaction.