In a study on the person-by-situation interaction on leadership, 9 una
cquainted female and male students completed a personality-adjective l
ist before they cooperated in 3 triads on 4 different assessment-cente
r tasks, each time with 2 new partners. The rotation design war run wi
th 4 samples of 9 subjects each, half of them men, half women. Each su
bject's contribution to the group process war ranked by the team membe
rs and by 2 observers. In each of the 4 9-person samples the main effe
ct of persons war much larger than the person-by-task (and group-compo
sition) interaction effect The personality pattern Low Emotional Stabi
lity/Low Independence was clearly a hindrance to influence for men, bu
t not far women. Social roles modify the influence of personality char
acteristics on leadership behavior attenuating the personality influen
ce more with women than with men. Finally, some practical conclusions
are drawn.