 Feminist engagements with science are linked thematically to SSK and forms of social constructivism by their recognition of the role of social factors as determinants of scientific fact. That said, they extend the analysis in a more specific way, reflecting particular concerns about the marginalization of points of view based on gender, ethnicity, socio-economic status, and political status. Not all feminist approaches are antirealist, but nearly all are normative, offering prescriptions for revising both scientific practice and concepts such as objectivity and knowledge that have direct implications for realism. In this regard it is useful to distinguish (as originally proposed in Harding 1986) between three broad approaches. Feminist empiricism focuses on the possibility of warranted belief within scientific communities as a function of the transparency and consideration of biases associated with different points of view which enter into scientific work. Standpoint theory investigates the idea that scientific knowledge is inextricably linked to perspectives arising from differences in such points of view. Feminist postmodernism rejects traditional conceptions of universal or absolute objectivity and truth. (As one might expect, these views are not always neatly distinguishable; for some early, influential approaches, see Keller 1985; Harding 1986; Haraway 1988; Longino 1990, 2002; Alcoff &amp; Potter 1993; and Nelson &amp; Nelson 1996).