The first objective of the study, conducted with 150 three-, four-, and five-year-olds, was to ascertain whether young children assign occupational and social roles by sex. The results obtained through the use of two newly devised instruments were positive. Children do assign social and occupational roles by sex. The second objective was to determine if these role assignments could be modified. An experimental curriculum was devised for half of the sample, the other half forming the control group. The results indicate that children's assignment of social and occupational roles can become more egalitarian, hence are modifiable. (Author)