Child-environment research crosses a range of disciplines and a range of physical settings from the child care center of the young child, to the urban neighborhood of the school-age child, to concern for sustainable development among some adolescents. This presentation reviews the potential of the Convention on the Rights of the Child to unify this diversity through a new research direction that focuses on identifying conditions for the successful implementation of the Convention at every environmental scale. It describes this new direction as a “third phase” of child-environment research, and briefly reviews the preceding phases on which it draws.