The main idea behind this view is that a belief is true if it "coheres" or is consistent with other things a person believes. For example, a fact a person believes, say "grass is green" is true if that belief is consistent with other things the person believes like the definition of green and whether grass exists and the like. It also depends on the interpretation of the main terms in those other beliefs. Suppose you’ve always lived in a region covered with snow and never saw grass or formed beliefs about this strange plant life. The claim "grass is green" would not cohere with other beliefs because you have no beliefs that include the concept "grass." The claim, "grass is green" would be nonsense because it contains a nonsensical term "grass." That is, you never formed a belief about grass so there’s nothing for this new belief to cohere with.
As you can see from the above description, coherence theories typically are described in terms of beliefs. This puts coherence theories in the "epistemic" view of truth camp noted above. This is because, coherence theorists claim, we can only ground a given belief on other things we believe. We cannot "stand outside" our own belief system to compare our beliefs with the actual world. If I believe Booth shot Lincoln, I can only determine if that belief is truth based on other things I believe like "Wikipedia provides accurate information" or "My professor knows history and communicates it well" or "Uncle John sure was a scoundrel".
These are other beliefs and serve as a basis for my original belief. Thus truth is essentially epistemic since any other model requires a type of access to the "real world" we simply can't have. As philosopher Donald Davidson describes the situation, "If coherence is a test of truth, there is a direct connection with epistemology, for we have reason to believe many of our beliefs cohere with many others, and in that case we have reason to believe many of our beliefs are true." (Davidson, 2000)
