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The goal of this chapter is to provide a selective overview of some important topics for behavioral genetic approaches to development and psychopathology. Although there is accumulating evidence that diverse domains of psychopathology are influenced to some degree by genetics, many areas have only been the target of family studies or not studied at all in terms of genetics. Only for a few disorders have we sufficient information to gauge the strength of the genetic effect. A hope for the future is that the ever-growing array of molecular genetic techniques will help to pinpoint not only the molecular basis for genetic influence on psychopathology, but also the biological pathways involved in maladaptive development. Just as important is the need to refine further our study of the environmental processes involved in the development of psychopathology.