The difficulty ofjinding a relationship between attitudes and behavior is one of thegreatest controversies i n recent social science research. Thepurpose of this study was to determine whether attitudinal relevance substantially affects the magnitude of the correlation between attitudes and behavior, and whether the effects are content-free. Using meta-analysis, we integratedjindings f r o m 138 attitude-behavior correlations with a total sample size of 90,908. The behaviors we studied ranged over 19 different categories and a variety of miscellaneous topics. Our results showed a strong overall attitude-behavior relationship (r = .791 when methodological artifacts were eliminated. Aspredicted, the higher the attitudinal relevance, the stronger the relationship between attitudes and behavior. This effect held true across diverse content domains. Implications f o r communication theoly and practice are discussed.The concept of attitude, typically viewed as a stable underlying disposition,' has played a central role in explaining communication phenomena, particularly the effects of persuasive messages. Most research in the area Although formal definitions of attitude vary, most contemporary theorists seem to agree that the characteristic attribute of attitude is its dispositional and evaluative nature. For instance, Ajzen (1988) defines an attitude as a disposition to respond favorably or unfavorably to an object, person, institution, or event. Rokeach (1967Rokeach ( , 1968) also defines an attitude as a set of interrelated predispositions to action organized around an object or situation.