ABSTRACT In their articles in this special section of the Journal of Personality, the authors have focused their attention on the role of individual differences in self-monitoring for a variety of interpersonal phenomena. In so doing, the authors have provided an overview of the theoretical and empirical contributions of the psychology of self-monitoring to the domains of interest: close relationships, consumer behavior, behavior in the workplace, and social interaction. As each of the contributing authors to this special section suggests, much more theoretical and empirical work is in order if the impact of individual differences in self-monitoring for the phenomena reviewed here is to be fully appreciated. Moreover, the four domains of interest represented in this special section by no means exhaust the areas to which theorists and researchers have applied or can apply the psychology of individual differences in self-monitoring. Given the large nomological network that currently exists involving the self-monitoring construct, it is anticipated that the breadth and depth of applications of the psychology of self-monitoring will only continue to expand as it has in the last 30 years since the appearance of the construct in the literature.