This chapter considers how to divide true beliefs that potentially rise to the level of knowledge from those that do not. Theories of knowledge identify a dimension for making the division. Other conditions may also need to be satisfied, but this dimension does the initial work in qualifying a true belief as a plausible candidate for knowledge. According to justification-based theories, the relevant dimension is the strength of the person's evidence. According to reliability theories, it is the degree of reliability of the processes generating the belief. For tracking theories, it is how extensive the range of counterfactual situations is in which the person's belief would track the truth. Whatever the proposed dimension, however, there is no nonarbitrary way of specifying a precise point along which a true belief becomes a credible candidate for knowledge.
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