These functionalist sociologists conducted research into family life in East London in the 1950s and early 1970s using large scale social surveys.
Stratified diffusion: changes in norms and values start among the wealthier in society and pass down to the lower classes.
They suggested family moved through a series of stages and predicted how family life would be organised in future generations, they developed an idea of the family developing through a number of stages through history - a march of progress:
-Stage 1: Pre-industrial family, based in rural areas and worked in agriculture. Operated together, as a unit of production.
-Stage 2: Early industrial family, industrial revolution, urban areas, new industries (manufacturing), unit of consumption, extended family networks, male and female time = separate, men work, women care for family.
-Stage 3: Symmetrical family, greater prosperity in post-war period, self-sufficient nuclear families, men and women shared leisure time, conjugal roles developed, but a division of tasks was still gender based. Male and female employment, but still based on gender stereotypes.
-Stage 4: Asymmetrical family, they predicted it would move down to working-class. Rich families had segregated conjugal roles, women employed helpers in home and they spent leisure time apart. There would be a limited application to current social hierarchy, particularly working-class families.
Evaluations of these sociologists:
-Feminists criticised the title of the symmetrical family. Women suffered a dual burden and triple shift of paid employment, domestic labour and emotional support of the family.
-The principle of stratified diffusion has limited application to society - as income inequality grows, lower classes cannot afford to access opportunities the same way the upper classes can.
-Their views didn't take into account the greater diversity of family types that were present outside of the nuclear family.