Parental sex-role performance has been used as a criterion for differentiating normal and pathogenic families. Sex roles assumed to be normative are normative only for a specific society at a specific time. Sex roles assumed to be normative in the modern, urban, middle-class family were determined by economic and social changes that took place in the early nineteenth century. These changes effected a new division of function between the sexes that had serious psychological consequences. A behavior code was formulated as a social response to the need to facilitate adaptation. The behavior prescribed in this code is behavior now defined by sociologists as normative. The problems the code attempted to alleviate have not diminished, and there is evidence suggesting that the prescribed behavior is itself a source of psychological strains. Social role performance, therefore, is an unsatisfactory criterion for identifying pathogenic families.
