Parsons functional fit theory: Family has a functional fit within todays society as it carries out functions ideally suited to it. Structural differentiation, structures such as education, work, health care, law&order and the media have taken over the function the family used to have. Industrialisation created need for family to be geographically mobile and socially mobile, and that it has moved from a unit of production to unit of consumption, believes that the privatised nuclear family suits modern industrial society most