Seldom, in reading a scientific manuscript, does one feel impelled to identify it as a potential scientific milestone. In this instance, the milestone may well mark a significant step toward the evolution of a new and more powerful paradigm for the scientific study of human development. To be sure, as the authors of the volume emphasize, any new “paradigm shift” (if such a phenomenon, in fact, will ever exist) still lies far ahead. Nor do the authors claim principal credit for having themselves achieved the progress that has been made. Rather, they call attention to what they have perceived as an emergent convergence and isomorphism, mostly over the past two decades, in the work of scientists in different disciplines, employing seemingly different theoretical perspectives, reporting results specific to delimited substantive domains, and yet, in the authors' view, all producing patterns of findings encompassable within the same general model of developmental structure and process. Moreover, the defining properties of the emergent model contradict, almost point for point, the now prevailing conceptual and operational strategies of choice in each specialized field of inquiry.