<p> Non-knowledge should not be simply regarded as the opposite of knowledge but as complementary to it: each derives its character and meaning from the other and from their interaction. Knowledge does not colonize the space of ignorance in the progressive march of science; rather knowledge and ignorance are mutually shaped in social and political domains of partial shifting and temporal relationships. This volume's ethnographic analyses provide a theoretical frame through which to consider the production and reproduction of ignorance non-knowledge and secrecy as well as the wider implications these ideas have for anthropology and related disciplines in the social sciences and humanities.</p>