This chapter describes the realistic accuracy model (RAM), starting with a history of its development. It then describes the four moderators of accuracy in personality judgment—good judge, good target, good trait, and good information—and how these moderators interact with each other. Next, it describes the four stages in the process of making accurate judgments, which are relevance, availability, detection, and utilization. Implications of the model for improving judgment accuracy and applications to judgments of states are then discussed. The chapter concludes with suggested directions for future research, including judgments of other levels of personality besides traits, interactions between moderators, the development of judgmental ability, and the consequences of judgmental accuracy.