Research findings on the early precursors of substance use and related adjustment difficulties have led to interest in developmental models to explain problem behavior. This paper examines five major themes that characterize the relationship among social context, individual disposition, and syndromes of problem behaviors that include substance use…

The 21st Century Learning Initiative is a transnational program concerned with improving education by changing outdated assumptions about how humans learn. This paper summarizes issues behind the organization's work. The first is the biological nature of learning; discussion of this issue includes a description of new research on the very young…