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In this much anticipated and overdue collaboration, Arnold Sameroff expertly and cleverly knits together seminal work by experts in the field by elucidating the bidirectionality of environmental influences on child development while simultaneously and deftly presenting the evolution of the transactional model of development. In the opening chapters of The Transactional Model of Development: How Children and Contexts Shape Each Other, Sameroff presents an overview of the theory behind the research and the evolution of the transactional model of development. The edited volume moves from the parent–child microcosm of infancy and early childhood to the social context of the school and wider society, with each successive chapter addressing some of the concerns raised by the previous study. Chapters focus on the development of temperament, behavior, and cognitions through transactions with the environment, addressing some, but raising even more, questions about plasticity and resilience in shifting the limits of human potential. The final section, New Directions, synthesizes research and theory, stimulating further evolution of the transactional model of development. The recursive format of this volume is an excellent foil for the transactional model as it both highlights and reminds the reader of the dynamic nature of development—of both children and theory alike. The transactional theory has long been used as a mainstay in public health, where the bidirectionality of interpersonal, organizational, community, and public policy factors in guiding health behaviors is well established (e.g., Babalola & Lawan, 2009; Cohen et al., 2003; McLeroy, Bibeau, Steckler, & Glanz, 1988). Developmental psychologists, however