This book sets forth a new model of development from a causal
perspective. As this is an area vital to several disciplines. It has
been written at multiple levels and for multiple audiences. It is based
on the work of Piaget and Neo-Piagetians, but also covers other major
models in development. It has elements that make it attractive as a
teaching text, but it is especially research-focused. It has clinical
applications. It presents many new ideas and models consistent with the
existing literature, which is reviewed extensively. Students,
researchers, and practitioners should find it useful. The models
presented in the present work build on models introduced in prior
publications (e.g., Young, 1990a, 1990b; 1997).