 To this point we have addressed cognitive diversity. But we might also be interested in diversity of social identity in epistemic communities. Social diversity is an important source of cognitive diversity, and for this reason can benefit the functioning of epistemic groups. For instance, different life histories and experiences may lead individuals to hold different assumptions and tackle different research programs (Haraway 1989; Longino 1990; Harding 1991; Hong and Page 2004). If so, then we may want to know: why are some groups of people often excluded from epistemic communities like those in academia? And what might we do about this?