This revised edition updates and extends theory and research on nonuniversal developmental domains and related topics. New chapters include a summary of ten years of additional research on the transitions model, as well as introductions to new work on the development of expertise, creativity, and cultural organisms. In this second edition, the author argues that developmental science has transformed since the first edition, consistent with the proposed changes for the field introduced in the first volume. Efforts are also made in this edition to bring the work into closer contact with cognitive science, educational research, contextual frameworks, and applied fields.