Introduction to the Special Issue: 20th-Century Origins and 21st-Century Developments of Peer Nomination Methodology.

This issue of New Directions for Child and Adolescent Development looks at current practices and recent advances in peer nomination methodology. Peer nominations provide a key method for assessing relationships, social status, and interpersonal behavior. This introductory article begins with a history of peer nomination methods, with a focus on the early origins of peer informant measures and the nature of Moreno's (1934) sociometric methodology (highlighting fundamental differences from the modern sociometric procedure). Next, the article addresses major changes that have occurred in peer nomination research over the course of the past 2 decades, including the recent focus on popularity and relational aggression, statistical advances, logistical challenges and innovations, and the changing conventions of the nomination procedure itself. The final section includes a brief overview of the articles included in this issue.