This monograph from the Center for Child Well-Being, looks at children's well-being holistically, integrating physical, cognitive, and social-emotional dimensions. The monograph begins by identifying elements of child well-being and then reviews the literature on well-being, describing foundational elements in physical, social-emotional, and cognitive well-being and their interrelationships. With these elements in mind, the monograph then discusses scientific implications and next steps in their application to child health and development (these include producing a governing framework, enhancing indicators of well-being, building a directory of indicators, creating a registry for interventions, developing a national index of well-being, and establishing a parenting network). The monograph concludes with recommendations for the future of child well-being, including developing a strategic plan and an alliance of child well-being partners. (Contains 142 references.) (EV)