Over the past five years there has been a growing body of literature that examines the relationships among some of psychology's most studied traits (Neuroticism, self-esteem, and locus of control). Core self-evaluation theory posits a conceptual and empirical relationship between these traits and job satisfaction. After briefly reviewing core self-evaluation theory, we examine the empirical evidence documenting a relationship between these traits and the two central criteria of interest to I/O psychologists—job satisfaction and job performance. We then examine the relationship between core self-evaluation traits and the Big Five personality traits. We conclude with a discussion of the contributions and limitations of core self-evaluation research and opportunities for future research. Copyright © 2003 John Wiley & Sons, Ltd.