Our response to Cervone (2005) can be summarized as follows. The factor structure of intraindividual fluctuations in personality-related variables does not bear on the evaluation of a model of (interindividual) personality structure. Even if such a model is associated with claims regarding the causal origins of its dimensions, this does not imply that the sources of between-person differences would be expected to be the same as the sources of within-person fluctuations. Moreover, observed differences between intraindividual and interindividual structures do not undermine the applicability of the latter to the description of individuals' personalities. Copyright © 2005 John Wiley & Sons, Ltd.