The book discusses the assumptions involved in such topics as stage theories, the nature-nurture issue, the issue of continuity-discontinuity, and the important role of philosophical ideas about theories – in particular, metatheories – in understanding the links between theory and research. It particularly focuses on relational developmental systems (RDS) metatheory, exploring its roots in the 1930s, following its development into the present day, and contrasting it with the fundamentally flawed genetic reductionist models that continue to be circulated by scientists, the media, and the general public. It discusses implications of theory for research methods and for applications aimed at the promotion of health, positive development, and social justice among diverse people across the life span.
Richard M. Lerner is the Bergstrom Chair in Applied Developmental Science and the Director of the Institute for Applied Research in Youth Development, in the Eliot Pearson Department of Child Study and Human Development, at Tufts University.