This article describes research on gender and processes of power and p
restige in task groups. We depart from standard analyses and use a mea
sure of opinion change to describe leadership on power and prestige or
ders. We use data from laboratory studies of single-gender and mixed-g
ender groups to test gender-role socialization, status characteristic,
and legitimation arguments. We find that all-female and all-male grou
ps are equally likely to develop power and prestige orders. Among init
ially leaderless, mixed-gender groups, males are five times more likel
y than females to exercise opinion leadership. Gender differences vani
sh, however, when we make a pretask assignment of leaders to mixed-gen
der groups. These findings are most consistent with status characteris
tic and legitimation theories, which correctly predict the outcomes of
three out of four studies. Gender-role arguments predict only one out
come out of four. Finally, our analyses of sociometric data provide ev
idence of gender bias in peer evaluations of female and male members o
f mixed-gender groups. We conclude by discussing the implications of o
ur research for additional work on gender and leadership processes.