The present study examined how self-esteem, locus of control, and interpersonal trust would predict Y2K-related behaviors and attitudes, including perceptions of the severity of the potential problem and steps taken to prepare for possible disruptions. Participants completed Rosenberg's (1965) Self-Esteem Scale, Levenson's (1981) Internality, Powerful Others, and Chance Scales, and Rotter's (1967) Interpersonal Trust Scale. Participants also responded to 30 Y2K-related items developed specifically for this study, and identified Y2K-preparatory items they had purchased. The results revealed that chance and interpersonal trust predicted both future behaviors and social fear, whereas sex and interpersonal trust predicted personal concerns about Y2K-related disruptions. The present research offers insight into how people perceive uncertainty as well as how they act when faced with a pressing uncertainty.