Richard C. Schwartz applies systems concepts of family therapy to the intrapsychic realm. The result is a new understanding of the nature of peoples subpersonalities and how they operate as an inner ecology, a s well as a new method for helping people change their inner worlds. C alled the Internal Family Systems (IFS) model, this approach is based on the premise that peoples subpersonalities interact and change in m any of the same ways that families or other human groups do. The model provides a usable map of this intrapsychic territory and explicates i ts parallels with family interactions.