Three modes of resistance to persuasion (biased assimilation, relative weighting of attributes, and minimization of impact) were examined in the context of a longitudinal field study of the Clinton-Lewinsky affair and a lab experiment in the consumer setting. Only two of these modes (biased assimilation and relative weighting) were found to be sensitive to the refutability of the persuasive communication; the effectiveness of the remaining one (minimization of impact) was not influenced by this factor. Specifically, committed individuals demonstrated biased assimilation in the face of easy to refute negative information, but this mode of resistance decreased in its effectiveness when the information became difficult to refute. The relative-weighting mode of resistance (decreasing the weight given to attributes influenced by the negative information and increasing the weight given to favorably evaluated attributes), in contrast, emerged only in the face of difficult to refute information, apparently when biased assimilation decreased in its effectiveness. The impact mode of resistance was fairly effective in the face of both easy and difficult to refute information. That is, committed respondents attempted to isolate the impact of the negative information to the target attribute, minimizing its spillover to the other attributes in the attitudinal representation in response to both easy and difficult to refute messages.T hat individuals with strong attitudes resist attitude change is a well-accepted finding in the consumer behavior and psychology literature (e.g., Eagly and Chaiken 1995;Haugtvedt and Petty 1992;Petty and Cacioppo 1986). However, relatively little attention has been given to the psychological processes that mediate resistance to persuasion (Ditto and Lopez 1992;Ditto et al. 1998;Eagly and Chaiken 1995;Edwards and Smith 1996;Kunda 1990). Observing this lack of attention to processes, Eagly and Chaiken (1995) recently issued a call to investigators to "understand the specific psychological mechanisms that enable people to thwart persuasive efforts" (p. 422). They suggest that, at this point, discussion of such processes "must necessarily be speculative, given the limited amount of research that has addressed mediating processes." Our research attempts to replace this speculation with theory and data.An understanding of resistance processes is important not only from the theoretical standpoint of understanding the dynamics of persuasion, but it also has substantial practical implications for marketers. For instance, Kunda (1990) *Rohini Ahluwalia is assistant professor of marketing and Charles W. Oswald Faculty Fellow at the School of Business, University of Kansas, Summerfield Hall, Lawrence, KS 66045 (e-mail: rahluwalia@ukans.edu). The author thanks the editor, associate editor, and reviewers for their constructive feedback and guidance, and Jack Brehm, Mike Etteridge, Steve Hillmer, Sam Green, Zeynep Gurhan-Canli, Jill Klein, Durairaj Maheswaran, and Vern Richardson for their input on this project....