This paper outlines a family systems model for treating incestuous families and discusses strategies for working effectively with families who remain intact after disclosure or who attempt to reunite after a separation. This systems model suggests that incest results not from intrapsychic problems of the victim or the offender, but from a pattern of dysfunctional relationships. The therapist's role is described as identifying and changing these dysfunctional patterns and helping the family develop new, healthy patterns of relating to one another. Subsystems which interact within the family are described and the hierarchical arrangement of these subsystems is examined. A generally accepted view of the incest family is outlined and translated into structural therapy terms. Specialized techniques and principles of a structural family model are offered to aid the therapist in helping the family alter and restructure dysfunctional parent-child and marital relationships. A discussion following the presentation of the model focuses on ways that the legal system conflicts with the treatment model. Suggestions from the mental health perspective are offered for ways in which the two systems can work together to serve the best interest of the child and the family. (NRB)