 Epistemologists who think that the JTB approach is basically on the right track must choose between two different strategies for solving the Gettier problem. The first is to strengthen the justification condition to rule out Gettier cases as cases of justified belief. This was attempted by Roderick  Chisholm;[11]  we will refer to this strategy again in  §7  below. The other is to amend the JTB analysis with a suitable fourth condition, a condition that succeeds in preventing justified true belief from being “gettiered”. Thus amended, the JTB analysis becomes a JTB+X account of knowledge, where the “X” stands for the needed fourth condition.