Due to the increasing inclusion of women a de-institutionalization of
gender relations has taken place over the last few decades. While gend
er differentiation has long been guaranteed institutionally, its repro
duction now increasingly requires symbolical marking and ''doing gende
r.'' This leads to a ''contextualization'' of gender differentiation,
i. e. the reproduction of gender inequality becomes a more and more co
mplex process depending on specific constellations. Using the example
of a study of occupational sex segregation this paper analyses the con
ditions for maintaining or weakening gender differences. It reports th
ree qualitative case studies, based on (participant) observation and i
n-depth interviews, in three occupational fields varying in the type a
nd extent of the male-female ratio: computer technology, nursing, and
insurance office personnel. The authors also briefly discuss the impli
cations which the assumption of a ''contextual contingent'' conditions
for gender differentiation may have on gender studies.