The present research investigated the cognitive processes involved in responding to self-report items under varying conditions of social desirability. Participants in three experiments judged the extent to which a set of items (personality traits in Experiments 1 and 2; behaviors in Experiment 3) described them under instructions that either increased or decreased concerns with social desirability. Under most conditions, instructions that produced the greatest concern with social desirability resulted in the longest response times. This finding is consistent with the view that social desirability operates as an editing process; participants retrieve the requested information and then evaluate it before responding. There was also some evidence for individual differences in social desirability; participants scoring high on the trait of self-deception were generally faster at making these judgments than were participants scoring low on self-deception.