Abstract
The purposes of this paper are to examine what change is considered as sex-role development and then to evaluate the sex differences of children by means of the rating standard of sex-role development examined before.
Taking a development for an average difference between two age groups, some hypotheses about sex-role development were tested by a statistical data of younger and older age groups of primary school children. Consequently 4 rating standards were selected: those were (1) an increase of the degree of coincidence in the norm of sex-role among boys and girls. (2) an increase of differentiation between masculine and feminine role, (3) specifications in masculine and feminine roles, and (4) an increase of deviation of self from the norm of sex-role.
Using rating standards of development ((2)-(4)), the sex differences were further analyzed. It was unexpectedly founded that boys developed earlier than girls. Some factors of the sex differences were considered.
