This paper explores two different traditions of gender difference rese
arch and theory. One tradition emphasizes similarities between the sex
es, whereas the other emphasizes differences. Feminist psychologists w
ho work within the similarities tradition focus on how women and men a
re alike in order to promote the full integration of women into the ma
le-dominated public world. Feminist psychologists who work within the
differences tradition focus on women's relational skills and women's g
reater valuing of connection and reciprocity in order to create a diff
erent world in which reciprocity is valued over hierarchy, connection
over separation, and caring over power. The reasons for the tension be
tween these two traditions is explored. I argue that rather than choos
e one of these two views, it is better to use the tension created to e
xplore the dialectic between similarity and difference. To illustrate
the usefulness of this tension, I explore the controversy around gende
r and moral reasoning. After examining the empirical and political con
cerns about linking an ethic of care to gender, I explore the interact
ion of care and justice with gender similarities and differences in de
veloping moral theory.