A society's stock of knowledge is structured in terms of what is generally relevant and what is relevant only to specific roles... the social distribution of knowledge entails a dichotomization in terms of general and role-specific relevance... because of the division of labor, role-specific knowledge will grow at a faster rate than generally relevant and accessible knowledge... The increasing number and complexity of [the resulting] sub universes [of specialized knowledge] make them increasingly inaccessible to outsiders.