So now we can see how, according to Chisholm at the time of [TK1], knowledge of the external world is possible. Let’s take the proposition that there is a doorknob here. How can I know that? Suppose I am looking at, smelling, feeling, and remembering the doorknob. Then via (B) lots of such propositions are reasonable for me. Suppose these all confirm the proposition, d, that there is a doorknob here. Then via (G), d is acceptable. Suppose all of these together with d form a concurrent set. Then via (H), d is reasonable. Suppose I think I am seeing the doorknob, and the proposition that there is a doorknob is a member of a concurrent set of acceptable propositions. Then it is evident to me that there is a doorknob here. If it’s true, then I know it. If all these conditions are satisfied, I have knowledge of the external world.