Book excerpt: The third edition of Handbook of Marriage and the Family describes, analyzes, synthesizes, and critiques the current research and theory about family relationships, family structural variations, and the role of families in society. This updated Handbook provides the most comprehensive state-of-the art assessment of the existing knowledge of family life, with particular attention to variations due to gender, socioeconomic, race, ethnic, cultural, and life-style diversity. The Handbook also aims to provide the best synthesis of our existing scholarship on families that will be a primary source for scholars and professionals but also serve as the primary graduate text for graduate courses on family relationships and the roles of families in society. In addition, the involvement of chapter authors from a variety of fields including family psychology, family sociology, child development, family studies, public health, and family therapy, gives the Handbook a multidisciplinary and interdisciplinary framework.