Finally, the potential relevance of social factors to epistemological questions also arose in discussion of Gettier cases. In particular, in response to cases involving evidence one does not possess, John Pollock (1986, 190–193)—citing Harman (1968, 1980), who in turn credits Sosa (1964) with the idea—suggested that there are certain things which we are “socially expected” to be aware of and that such expectations bear upon whether one knows. But if that’s so, and if there is some kind of variability in such expectations, there will be a similar, socially-based variation in the standards for knowledge.