Edited and authored by leaders in the field, this comprehensive three-volume set lays a solid foundation for integrating theory, research, practice, and policy in contemporary family psychology. Volume 1 describes the theoretical and methodological underpinnings of the discipline, including an overview of traditional theories; influential contemporary theories; and complex research designs, statistical modeling, and experience sampling, among other topics. The volume presents a lifespan approach to family psychology, recognizing the importance of addressing how families change over time, and it discusses different forms of contemporary families. Volume 2 focuses on the application of family psychology to an array of mental and physical health conditions, societal issues, and shared systems such as schools and health care. Volume 3 addresses contemporary couple, family, and parenting interventions grounded in family psychology theory and science, as well as issues related to family psychology training. The vast scope of the handbook argues that family psychology has evolved to have a major impact not only on the practice of psychology, but also on how researchers in the field investigate the complexities of the human condition.